(1)如图 1,在矩形 ABCD 中,AB=4,BC=10,若要在该矩形中作出一个面积最大的△BPC,且使∠BPC=90°,求满足条件的点 P 到点 A 的距离.
(2)如图 2,有一座古井 O,按规定,要以井 O 为对称中心,建一个面积尽可能大的形状为平行四边形的景区 ABCD.根据实际情况,要求顶点 A 是定点,点 A 到井 O 的距离为
米,∠BAD=120°,那么,是否可以建一个满足要求的面积最大的平行四边形景区 ABCD?若可以,求出满足要求的平行四边形 ABCD 的最大面积;若不可以,请说明理由.(井 O 的占地面积忽略不计)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/6737d4f1-6918-4be6-ada2-9d96ad249a27.png?resizew=387)
(3)为了保护古井 O(井 O 的占地面积忽略不计),拟以古井 O 为中心划定边长为 30 米的正方形景区,在该正方形区域内选择若干个安装点,安装一种电讯信号转发装置,其发射直径为 31 米.现要求:在该正方形区域每个点安装一个这种转发装置,使这些装置转发的信号能完全覆盖这个景区.问:
①能否找到这样的 4 个安装点,使得这些点安装了这种转发装置后能达到预设的要求?
②至少需要选择多少个安装点,才能使这些点安装了这种转发装置后达到预设的要求?
答题要求:请你在解答时,画出必要的示意图,并用必要的计算、推理和文字来说明你的理由.(下面给出了几个边长为 30 米的正方形区域示意图,供解题时选用)
(2)如图 2,有一座古井 O,按规定,要以井 O 为对称中心,建一个面积尽可能大的形状为平行四边形的景区 ABCD.根据实际情况,要求顶点 A 是定点,点 A 到井 O 的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd1766294dc48dd810a6ab4840703a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/6737d4f1-6918-4be6-ada2-9d96ad249a27.png?resizew=387)
(3)为了保护古井 O(井 O 的占地面积忽略不计),拟以古井 O 为中心划定边长为 30 米的正方形景区,在该正方形区域内选择若干个安装点,安装一种电讯信号转发装置,其发射直径为 31 米.现要求:在该正方形区域每个点安装一个这种转发装置,使这些装置转发的信号能完全覆盖这个景区.问:
①能否找到这样的 4 个安装点,使得这些点安装了这种转发装置后能达到预设的要求?
②至少需要选择多少个安装点,才能使这些点安装了这种转发装置后达到预设的要求?
答题要求:请你在解答时,画出必要的示意图,并用必要的计算、推理和文字来说明你的理由.(下面给出了几个边长为 30 米的正方形区域示意图,供解题时选用)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/31f76fb1-a49c-4f48-ab2d-8ff1ce2b90f2.png?resizew=365)
更新时间:2022-09-26 20:09:30
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相似题推荐
解答题-问答题
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困难
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解题方法
【推荐1】问题提出:
(1)如图1,在矩形
内,以
的中点F为圆心,
为直径作半圆.P为半圆上一点,若
,
,试求
的面积的最小值.
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497903017304064/2497956054614016/STEM/7131ce6bdafa4beea6d8eeddbe2ef0c4.png?resizew=145)
问题探究:
(2)如图2,在菱形
中,
,
,P是菱形
内或边上的一点,且
,连接
,求
面积的最小值.
问题解决:
(3)如图3,在市区有一块矩形形状的闲置空地
要进行规划,其中
米,
米,E是
边上一点,且
米,F是
边上的任意一点,把
改造成一个供市民休息的区域,
是
关于
的轴对称图形,在
区域放置“保护野生动物,拒绝食用野生动物”的宣传与警示栏.同时修建
四条观光道,在四边形空地
种植草坪,剩余两个三角形区域种植鲜花,试求草坪
的面积的最小值.
(1)如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497903017304064/2497956054614016/STEM/dabc9e148045432db3cf484fd0fe33fd.png?resizew=133)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497903017304064/2497956054614016/STEM/ecfdda8c39364da6845e5ae3de49c903.png?resizew=183)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497903017304064/2497956054614016/STEM/7131ce6bdafa4beea6d8eeddbe2ef0c4.png?resizew=145)
问题探究:
(2)如图2,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695525d00319665b1ad0d01717979523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87069f4fe2ed525b042c9daac39e295b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/488ca4a5739465599fbf48c724f133b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b465c5d8a5861b7b130e56dde8b1ae.png)
问题解决:
(3)如图3,在市区有一块矩形形状的闲置空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbb91d806e628cf978557ffad6a7020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff689e15e65a3920646f9350bfc1612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea95119fcd25b355f83408beb488962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c353d6224e57c9b60c8d2919793ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb78bddee5406ae514db9a1d0a903f0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb78bddee5406ae514db9a1d0a903f0a.png)
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名校
【推荐2】在
中,
.
, 以
为边在
下方作等边,
,
与
交于点O,连接
,求四边形
的面积;
(2)如图2,若
,以
为边在
下方作等边
,连接
,过点A作
于点E,求证∶
;
(3)如图3,若
,在
下方作等腰
,过点F作
交
延长线于点G,T为
中点,M为
延长线上一点,将
绕点F顺时针旋转至
,旋转角为
,连接
,
,
,
,
,当
最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe77c7a930d382858d34a687a29913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caadaca1d55a032cea72224c800f6072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1407e6138439ad39d0f8ebe31f7263a1.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702f3bab242d53b8fbcb9fde925953b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be73a932ff74399eafef014055ee9f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93007c1e531d19ea36757954b9fb7772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3233dbbd70b3c7ab56450a7a0971e951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb2c723886efd3f7a016281fa01ff5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2787c09a6dd07ba5ab7af7f2856711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56aa199e4aefa12102f57c4b3f1a9070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed11fc0bb3a04d0f10a3a7363fe635cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a96cb598904312b0dd2e8996e18797ca.png)
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【推荐3】如图,平面直角坐标系中,菱形OABC的边OA在x轴正半轴上,OA=10,cos∠COA
.一个动点P从点O出发,以每秒1个单位长度的速度沿线段OA方向运动,过点P作PQ⊥OA,交折线段OC﹣CB于点Q,以PQ为边向右作正方形PQMN,点N在射线OA上,当P点到达A点时,运动结束.设点P的运动时间为t秒(t>0).
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647932541476864/1719438737448960/STEM/ff66b8cbb6af4074935eb85a43414ec9.png?resizew=469)
(1)C点的坐标为 ,当t= 时N点与A点重合;
(2)在整个运动过程中,设正方形PQMN与菱形OABC的重合部分面积为S,直接写出S与t之间的函数关系式和相应的自变量t的取值范围;
(3)如图2,在运动过程中,过点O和点B的直线将正方形PQMN分成了两部分,请问是否存在某一时刻,使得被分成的两部分中有一部分的面积是菱形面积的
?若存在,请求出对应的t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2dcc5a28daac51d2e32aea8ab9ba7a.png)
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647932541476864/1719438737448960/STEM/ff66b8cbb6af4074935eb85a43414ec9.png?resizew=469)
(1)C点的坐标为 ,当t= 时N点与A点重合;
(2)在整个运动过程中,设正方形PQMN与菱形OABC的重合部分面积为S,直接写出S与t之间的函数关系式和相应的自变量t的取值范围;
(3)如图2,在运动过程中,过点O和点B的直线将正方形PQMN分成了两部分,请问是否存在某一时刻,使得被分成的两部分中有一部分的面积是菱形面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e4c30981fd0794c8b8f2c21b7af6b3.png)
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【推荐1】阅读材料:小百合特别喜欢探究数学问题,一天万老师给她这样一个几何问题:
如图1,
和
都是等边三角形,将
绕着点
旋转
,求证:
.
【探究发现】(1)小百合很快就通过
,论证了
,于是她想,把等边
和等边
都换成等腰直角三角形,如图2,将
绕着点
旋转
,其中
那么
和
有什么数量关系呢?请写出你的结论,并给出证明.
【拓展迁移】(2)如果把等腰直角三角形换成正方形,如图3,将正方形
绕点
旋转
,若
,
,在旋转过程中,当
,
,
三点共线时,请直接写出
的长度.
【拓展延伸】(3)小百合继续探究,做了如下变式:如图4,矩形
矩形
,且具有公共顶点
,将矩形
固定,另一个矩形
绕着点
顺时针旋转
,连接
、
,直线
交
于点
,在旋转的过程中,试证明
为
的中点.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
【探究发现】(1)小百合很快就通过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074887bdd8da63f19f3e488ae2275d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0dd821851a38e5cbe13f63bee31fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【拓展迁移】(2)如果把等腰直角三角形换成正方形,如图3,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f875de8bec0ffc84b8142f81080058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406e7d1e7977dd5b30ef81cfdc8e8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93401a1551b7e3c5bda0c9bb7220e01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
【拓展延伸】(3)小百合继续探究,做了如下变式:如图4,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef82ace37652c02cf6769a3c70e6890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3190817cb33e1f1c63d5c71da6b1a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3190817cb33e1f1c63d5c71da6b1a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a746c4297a3a8b8062fd5127d03ecf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/79507e46-7648-475d-bc9c-23f3aed84b94.png?resizew=730)
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【推荐2】问题发现:(1)如图①,在正方形
中,
,点E、F分别在
边,且
,则
的长为________;
问题探究:(2)如图②,在矩形
中,
,
,点E、F分别在
边上运动,且
始终保持与对角线
的夹角
,求当
最小时线段
的长;
问题解决:(3)某信息兴趣小组利用电脑成功设计了一个点的运动程序:在平面直角坐标系
中,已知点
,N.对于点P给出如下运动法则:将点P向右(
)或向左(
)平移
个单位长度,再向上(
)或向下(
)平移
个单位长度,得到点
,点
关于点N的对称点为Q,称点Q为点P的“对应点”.
利用上面的运动程序解决下面的问题:已知
,
,若点
,点N为直线
上一个动点,点P为平面直角坐标系内任意一点,且Q为点P的“对应点”,连接
与直线
相交于点E,试求
的最小值及此时点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a98f1741fdacc7966fc4172139beba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
问题探究:(2)如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13ff2b69d7eac7a9775905345c9bf8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817585e3c52d2549cf86b2c5ad015e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/31908c46-b4de-4919-ab23-9c9ee009ac97.png?resizew=441)
问题解决:(3)某信息兴趣小组利用电脑成功设计了一个点的运动程序:在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d6bb01f1044358cc5fee441bc62489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a915c1a8a9304aeb307d130faaeb15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce22731a412796fe2925e01f765d5976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
利用上面的运动程序解决下面的问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03add3189e2b3984c68146d0d95a963e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e701fb78cd62d7b8d257a50a5e643e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/b6467719-b4e6-467c-b282-39293052b6b3.png?resizew=335)
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【推荐3】如图(1),在边长为4的正方形
中,在AO的延长线上取点B,使OB=2OA,连接BC.
(1)点
是线段
的中点,连结
,求线段
的长;
(2)点M在线段BC上,且到OB,OC的距离分别为
,
,当
时, 求
,
的值;
(3)如图(2),在第(1)、(2)问条件下,延长
交直线
于点N,动点
在
上从点
向终点
匀速运动,同时,动点
在
延长线上,沿直线
向终点M匀速运动,它们同时出发且同时到达终点.当点
运动到
中点时,点
恰好与点
重合.
①在运动过程中,设点
的运动路程为s,
,用含t的代数式表示s.
②过点O作
于点
,在运动路程中,当
与
的一边平行时,求所有满足条件的
的长.
![](https://img.xkw.com/dksih/QBM/2019/11/14/2333604824113152/2336005857222656/STEM/3d2a3d6b0f7843699f385a52cf14d6fc.png?resizew=271)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8735e2de0ec29640d1eff9e043556030.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(2)点M在线段BC上,且到OB,OC的距离分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec1f892314ee2c2949efef8d488adf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)如图(2),在第(1)、(2)问条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①在运动过程中,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa618d795ebf3d95fcfea6bf44ce9cc.png)
②过点O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e532f1347c0a24a45758be8464e487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c3b6c7e609061ef22832bf5c1df5d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/2019/11/14/2333604824113152/2336005857222656/STEM/3d2a3d6b0f7843699f385a52cf14d6fc.png?resizew=271)
![](https://img.xkw.com/dksih/QBM/2019/11/14/2333604824113152/2336005857222656/STEM/f247c93724dc401c97a928ce48035ebc.png?resizew=279)
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名校
【推荐1】如图,在
中,以
为直径的
,交
于点
,且
交直线
于点
,连接
.
如图1,求证:
;
如图2,
为钝角时,过点
作
于点
求证:
;
如图3,在
的条件下,在∠BDF的内部作
,使
分别交
于点
交
于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157e9717759d2431e22722927e236696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1aa11abee5806a4c98cfd78a4b81198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5c664aa79a88c035d7ece15220a4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e2fcfba2a61f28e72ba61e37cd622b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63961e62677af8ea8d9aef79a36e794a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88611a74dd6eb28779e956e25b3e989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6efe567dcaf35148c4f76771ba0259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a80db4ab011ed01bc49da7efd4c6363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b6bd89ce5225f58a39135a16719173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466152420786176/2466768837459968/STEM/b72747e8-27b7-4285-9a08-18b20c23b0f6.png)
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解题方法
【推荐2】如图,点A,B,C分别是
上的三等分点,连接
,
,
.点D,E分别是
,
上的点,且
.过点D作
的垂线,垂足为H,与
分别交于N、M,与边
交于F点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/5bd22f22-fa54-4b62-9469-14ea7e5a0dc5.png?resizew=164)
(1)求证:
是等边三角形;
(2)探索
与
的数量关系,并加以证明;
(3)点E从点B沿
方向运动到点C,点H也随之运动,若
的半径为2,则点H运动的路径长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/5bd22f22-fa54-4b62-9469-14ea7e5a0dc5.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(3)点E从点B沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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困难
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名校
【推荐3】问题提出(1)如图①,在△ABC中,BC=6,D为BC上一点,AD=4,则△ABC面积的最大值是 .
问题探究(2)如图②,已知矩形ABCD的周长为12,求矩形ABCD面积的最大值.
问题解决(3)如图③,△ABC是葛叔叔家的菜地示意图,其中AB=30米,BC=40米,AC=50米,现在他想利用周边地的情况,把原来的三角形地拓展成符合条件的面积尽可能大、周长尽可能长的四边形地,用来建鱼塘.已知葛叔叔欲建的鱼塘是四边形ABCD,且满足∠ADC=60°.你认为葛叔叔的想法能否实现?若能,求出这个四边形鱼塘周长的最大值;若不能,请说明理由.
问题探究(2)如图②,已知矩形ABCD的周长为12,求矩形ABCD面积的最大值.
问题解决(3)如图③,△ABC是葛叔叔家的菜地示意图,其中AB=30米,BC=40米,AC=50米,现在他想利用周边地的情况,把原来的三角形地拓展成符合条件的面积尽可能大、周长尽可能长的四边形地,用来建鱼塘.已知葛叔叔欲建的鱼塘是四边形ABCD,且满足∠ADC=60°.你认为葛叔叔的想法能否实现?若能,求出这个四边形鱼塘周长的最大值;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448417131126784/2449630354522112/STEM/0581333586404052911d584dd977807e.png?resizew=483)
您最近一年使用:0次
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困难
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【推荐1】如图:在△ABC中,∠ABC=90°,以AB为直径作⊙O交AC于点D,点E是
上一点,AB=12,连接BE交AC于点F;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/26/b5ecb557-c203-4a1b-abd7-639bccec5eb4.png?resizew=411)
(1)若点E是
的中点,求证:CB=CF;
(2)若AF=8,△CFB是以CF为腰的等腰三角形,试求BE的长;
(3)在(1)的条件下,连接DB,作∠ADB的角平分线交BE于点G,交⊙O于点H,若点G为BE的中点,直接写出DH的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/26/b5ecb557-c203-4a1b-abd7-639bccec5eb4.png?resizew=411)
(1)若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
(2)若AF=8,△CFB是以CF为腰的等腰三角形,试求BE的长;
(3)在(1)的条件下,连接DB,作∠ADB的角平分线交BE于点G,交⊙O于点H,若点G为BE的中点,直接写出DH的长.
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【推荐2】如图1,在矩形 ABCD 中,AB= 8,BC= 6,动点E从点A出发沿线段AB以每秒1个单位长度的速度匀速运动,到达点B时停止,在运动过程中,经过 A、D、E三点的☉O交线段 BD于点K,交线段CD于点H,将△ADE 沿DE翻折得到△GDE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/c6f742e8-8d4f-4218-a848-66b478ccbd0f.png?resizew=414)
(1)求证:四边形AEHD是矩形;
(2)当点G恰好落在点K处时,求线段HG的长;
(3)如图2,连接AG交DE于点P,并延长AG交∠GDC的平分线于点R,设点E运动的时间为t(0<t<8)秒,△BCR的面积为S,求S关于时间t的函数关系式.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/c6f742e8-8d4f-4218-a848-66b478ccbd0f.png?resizew=414)
(1)求证:四边形AEHD是矩形;
(2)当点G恰好落在点K处时,求线段HG的长;
(3)如图2,连接AG交DE于点P,并延长AG交∠GDC的平分线于点R,设点E运动的时间为t(0<t<8)秒,△BCR的面积为S,求S关于时间t的函数关系式.
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【推荐3】如图1,已知AB为半圆O的直径,AB=2,线段AI⊥AB,延长AB至点G,使BG=AB,以点B为圆心,线段AG为直径作半圆B,点D是半圆B上一点,过点D作DF⊥AI于点F,连结AD,BD,其中AD交半圆O于点E.连接EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/ebb6b084-08d5-4540-85be-2b5f12afc522.png?resizew=548)
(1)求证:AE=DE.
(2)设
,
,求y关于x的函数表达式及自变量x的取值范围.
(3)如图2,以BG为直径作半圆
,BD交半圆O或半圆
于点J,连结FB交AD于点K,连结KJ,当点K将线段FB分为2:3两部分时,求
DFK与
BJK的面积之差.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/ebb6b084-08d5-4540-85be-2b5f12afc522.png?resizew=548)
(1)求证:AE=DE.
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0124d4c22e17a6b719cf2d0f0b305e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39f428621c72cd807963ffaae5c6d97.png)
(3)如图2,以BG为直径作半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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