如图1,在平面直角坐标系中,等边
的顶点A在y轴的正半轴上,B,C在x轴上.已知等边
的边长为6,点D是x轴上一点,连接
.
(2)如图2,当点D在点B左侧时,将线段
绕点A逆时针 旋转角度
得到线段
,连接
,
.
①当
时,
恰好平分
,若点D坐标为
,求
的长;
②如图3,当
时,设点D坐标为
,记
的面积为S,求S关于x的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,当点D在点B左侧时,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2453191f0cc8150211759f1c6c455909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db97968b1674b4f471caabc31ad42dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a24d333fbac6a24e949408643f62836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a277e79f12c5f5763e5e91f958a00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
2024·广东肇庆·二模 查看更多[2]
更新时间:2024-06-02 14:45:00
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】等边
的边长为4,D是射线
上任一点,线段
绕点
顺时针旋转
得到线段
,连接
.
(1)当点D是
的中点时,如图1,判断线段
与
的数量关系.
(2)当点D是
边上任一点时,如图2,请用等式表示线段
,
,
之间的数量关系,并证明:
(3)当点D是
延长线上一点且
时,如图3,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/ba2b8f74-af9f-43f7-a188-334f58ae42e9.png?resizew=505)
(1)当点D是
![](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/4eedae8d316c76e3d0b451256de03fb9.png)
(2)当点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)当点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在△ABC中,AB=AC,点D,E,F分别在AB,BC,AC边上,且BE=CF,BD=CE.
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296975792111616/2302780042625024/STEM/a5b396c0584e48ef8067dab936ccd3fd.png?resizew=119)
(1)求证:DE=EF;
(2)当∠A=44°时,求∠DEF的度数;
(3)当∠A等于多少度时,△DEF成为等边三角形?试证明你的结论.
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296975792111616/2302780042625024/STEM/a5b396c0584e48ef8067dab936ccd3fd.png?resizew=119)
(1)求证:DE=EF;
(2)当∠A=44°时,求∠DEF的度数;
(3)当∠A等于多少度时,△DEF成为等边三角形?试证明你的结论.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在
中,
,
于D,将
沿
所在的直线折叠,使点D落在点E处;将
沿
所在的直线折叠,使点D落在点F处,分别延长
、
相交于点G.
![](https://img.xkw.com/dksih/QBM/2022/7/5/3015906394349568/3025965856112640/STEM/8bdabefdcfb640d5b7d6971d13d9502e.png?resizew=120)
(1)判断四边形
的形状,并给予证明;
(2)若
,四边形
的面积为36,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/2022/7/5/3015906394349568/3025965856112640/STEM/8bdabefdcfb640d5b7d6971d13d9502e.png?resizew=120)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135fa1bcd82d561853be958e71a2b49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在
中,
,
是
的中点,以
为直径作
,交边
于点
,连接
,
.
是
的切线;
(2)若
是
的切线,
,求
的长.
![](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/8455657dde27aabe6adb7b188e031c11.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,
为矩形
的对角线,将边
沿
折叠,使点
落在
上的点
处,将边
沿
折叠,使点
落在
上的点
处.
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805304928026624/2809961103171584/STEM/1f4df2da-5d7e-4883-a228-2224df313b72.png)
(1)求证:
;
(2)
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805304928026624/2809961103171584/STEM/1f4df2da-5d7e-4883-a228-2224df313b72.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】探索:如图1,在
中,
,
.求证:
;
发现:直角三角形中,如果有一个锐角等于
,那么这个角所对的直角边等于斜边的_______.
应用:如图2,在
中,
,
,
,点
从点
出发沿
方向以
秒的速度向点A匀速运动,同时点
从点A出发沿
方向以
秒的速度向点
匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点
运动的时间是
秒(
).过点
作
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480911449636864/2481214607745024/STEM/73d69aca-a0e9-4c5e-adc0-6d1330903abb.png?resizew=316)
(1)四边形
能够成为菱形吗?如果能,求出相应的
值;如果不能,请说明理由;
(2)当
为何值时,
为直角三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefc12c61c95d8e36846a6aac1c9105b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5811af165584f8fe9601cf5cdee2e80e.png)
发现:直角三角形中,如果有一个锐角等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
应用:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefc12c61c95d8e36846a6aac1c9105b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee8ec986cd7ce3d1959ac86e4bf872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de222a1975e25ba3ce7c2fdaa9097a80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6156798a008981f813f02c0d250fc74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdcbcecd35ef94b599101f570113da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480911449636864/2481214607745024/STEM/73d69aca-a0e9-4c5e-adc0-6d1330903abb.png?resizew=316)
(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28331ca4051cf57b90b369180c93263.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】如图所示,在计算机白色屏幕上,有一矩形着色画刷ABCD,AB=1,AD=
,将画刷以B为中心,按顺时针转动
位置(
点转在对角线BD上),求屏幕被着色的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/bfedf7bc-d75d-44c4-9283-f5f83f15d399.png?resizew=191)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在Rt△ABC中,∠A=90°,AB=AC,D、E分别在AB,AC上,且AD=AE.若△ADE绕点A逆时针旋转,得到△AD1E1,设旋转角为a(0<
≤180°),记直线BD1与CE1的交点为P.
(1)求证:BD1=CE1;
(2)当∠CPD1=2∠CAD1时,求旋转角为
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(1)求证:BD1=CE1;
(2)当∠CPD1=2∠CAD1时,求旋转角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2021/9/11/2805931738628096/2806675356573696/STEM/4be0f672c07f4d619c583f172ce2b97e.png?resizew=186)
您最近一年使用:0次