如图,在△ABC中,∠BAC=90°,AB=AC,点P为线段AC上一点,点Q在线段AB的延长线上,CP=BQ,连接PQ交BC于点D,点P关于BC的对称点为E,连接AE.
(1)依题意补全图1;
(2)求证:D是PQ的中点;
(3)用等式表示AE和PQ的数量关系,并证明.
(1)依题意补全图1;
(2)求证:D是PQ的中点;
(3)用等式表示AE和PQ的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/c8b04ce8-5889-4213-8cd4-634b3444b6ed.png?resizew=238)
更新时间:2020-04-25 22:33:40
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【推荐1】中华文明源远流长,如图①是汉代数学家赵爽在注解《周髀算经》时给出的图形,人们称之为赵爽弦图,被誉为中国数学界的图腾.2002年北京国际数学家大会依据赵爽弦图制作了会标,该图有4个全等的直角三角形围成一个大正方形和中间一个小正方形,巧妙的证明了勾股定理.
问题发现
如图①,若直角三角形的直角边BC=3,斜边AB=5,则中间小正方形的边长CD=______,连接BD,△ABD的面积为______.
知识迁移
如图②,P是正方形ABCD内一点,连接PA,PB,PC,当∠BPC=90,
时,△PAB的面积为______.
拓展延伸
如图③,已知∠MBN=90°,以点B为圆心,适当长为半径画弧,交射线BM,BN分别于A,C两点.
(1)已知D为线段AB上一个动点,连接CD,过点B作BE⊥CD,垂足为点E;在CE上取一点F,使EF=BE;过点F作GF⊥CD交BC于点G,试判断三条线段BE,DE,GF之间的数量关系,并说明理由.
(2)在(1)的条件下,若D为射线BM上一个动点,F为射线EC上一点,当AB=10,CF=2时,直接写出线段DE的长.
问题发现
如图①,若直角三角形的直角边BC=3,斜边AB=5,则中间小正方形的边长CD=______,连接BD,△ABD的面积为______.
知识迁移
如图②,P是正方形ABCD内一点,连接PA,PB,PC,当∠BPC=90,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5e96e83f99f567ab30af2af91ca531.png)
拓展延伸
如图③,已知∠MBN=90°,以点B为圆心,适当长为半径画弧,交射线BM,BN分别于A,C两点.
(1)已知D为线段AB上一个动点,连接CD,过点B作BE⊥CD,垂足为点E;在CE上取一点F,使EF=BE;过点F作GF⊥CD交BC于点G,试判断三条线段BE,DE,GF之间的数量关系,并说明理由.
(2)在(1)的条件下,若D为射线BM上一个动点,F为射线EC上一点,当AB=10,CF=2时,直接写出线段DE的长.
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【推荐2】某社区广场有一块正方形花园
,其中
,E是
的中点.
(1)如图1,经过规划,需要修建两条小道
、
,M是
上一点,社区为节省修建时间和费用,要使得所修建的小道
的值最小,试求此时
的长和
的最小值
(2)如图2,社区广泛收集居民建议,重新设计了方案,修建四条小道
、
、
、
,其中M、N均在
上,且N在M的右边,
,要使得修建的小道
的值最小,试求此时
的长和
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d68ed01cac3a30c9321376d5190230.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/12164b26-1785-437a-aa30-c56c3fd4b197.png?resizew=320)
(1)如图1,经过规划,需要修建两条小道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf7f5422a02aed24437295a01b11df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf7f5422a02aed24437295a01b11df0.png)
(2)如图2,社区广泛收集居民建议,重新设计了方案,修建四条小道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e643bd709da3969badf399cb16e0b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d443c1f801e90fe51fd288f2308e3a42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
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【推荐1】如图1,在平面直角坐标系xOy中,已知平行四边形OABC的顶点O为坐标原点,顶点A在x轴的正半轴上,B、C在第一象限内,且OA=6,OC=3
,∠AOC=45°.
![](https://img.xkw.com/dksih/QBM/2021/7/21/2768789858279424/2774001104338944/STEM/c86fee78407f461796e4e11b2b95f7f4.png?resizew=505)
(1)顶点B的坐标为 ,顶点C的坐标为 ;
(2)设对角线AC、OB交于点E,在y轴上有一点D(0,﹣1),x轴上有一长为1个单位长度的可以左右平移的线段MN,点M在点N的左侧,连接DM、EN,求DM+EN的最小值;
(3)如图2,若直线l:y=kx+b过点P(0,﹣2),且把平行四边形OABC的面积分成1:2的两部分,请直接写出直线l的函数解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/21/2768789858279424/2774001104338944/STEM/c86fee78407f461796e4e11b2b95f7f4.png?resizew=505)
(1)顶点B的坐标为 ,顶点C的坐标为 ;
(2)设对角线AC、OB交于点E,在y轴上有一点D(0,﹣1),x轴上有一长为1个单位长度的可以左右平移的线段MN,点M在点N的左侧,连接DM、EN,求DM+EN的最小值;
(3)如图2,若直线l:y=kx+b过点P(0,﹣2),且把平行四边形OABC的面积分成1:2的两部分,请直接写出直线l的函数解析式.
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【推荐1】射线
射线BN,
,
,以O为圆心,AB为直径画
,点E是
右半圆上的动点,点D是射线AM上的一动点,线段DE的延长线交射线BN于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/033eb799-fff6-42b0-aacb-21e30db9ee5d.png?resizew=341)
(1)当OD平分
时,求证:DC是
的切线;
(2)在(1)的条件下,设
,
,求y关于x的函数解析式,写出自变量的取值范围;
(3)当
,
时,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59536d6557e1c1173764aadad269736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d00be47dcb89793f14a2fd10f4c522b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a6fde2d385112a26a0976fd5d79c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/033eb799-fff6-42b0-aacb-21e30db9ee5d.png?resizew=341)
(1)当OD平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b299f5cddf9da033ec3a996f42ae54b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6bb28e6bd666440c3ca262db9ea7f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d32ad2221530be1dc6f86b9e73a04d.png)
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【推荐2】在平面内,旋转变换是指某一图形绕一个定点按顺时针或逆时针旋转一定的角度而得到新位置图形的一种变换.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/65a7fb81-9fff-43cb-9fd5-665ae0480c34.png?resizew=372)
【问题提出】
(1)如图①,在
中,点D为斜边AB上的一点,
,
,且四边形
是正方形,小明运用图形旋转的方法,将
绕点D逆时针旋转
,得到
(如图②所示),请你写出阴影部分的面积: ;
【问题探究】
(2)如图③,在四边形
中,
,
,
,
,过点A作
,垂足为E,求AE的长;
【问题解决】
(3)如图④,在四边形
中,
,
,将BC绕点B逆时针旋转
得到线段BE,连接AE.若
,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/65a7fb81-9fff-43cb-9fd5-665ae0480c34.png?resizew=372)
【问题提出】
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3746205daae4787d8e31d74ba79e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b2ac64b0463f3fcbb725ea7f59e45c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af9fe604650641a65843cc05d3aca25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79d6deffb965386f2830b8383e29a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc956c0e5f2096313b5bf2f586531ec7.png)
【问题探究】
(2)如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb32dae6823f572ffa028d684733c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9331fc29878c84b6a6a6a81d15b9eba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6090bcc0214538f0b2e95e13e508f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebad1043443cbb6ea67a53ee96d5026c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7243e07ec64ced92d43fcf64a47295.png)
【问题解决】
(3)如图④,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8da8430ae9b811b82527eb944cea18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4e4b72607f34923d90890c25475449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b193272440e46c1339accbc851bd42a7.png)
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【推荐1】在等边
中,点
分别在边
上,以
为边向右作等边
.
(1)如图1,若
.
①求证:
;
②连接
,求
的度数.
(2)如图2,已知
的面积是
为
的中点,若
,连接
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/644acafd-9b17-458a-a3b2-29c9f1ba6459.png?resizew=235)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d379ef9a50ae13b4264559ddd64da4.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56e79a7412a1c5159979295dd62bbd7.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd94dd51562ecbee6edd4265326b765.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5869ead52eae43c450b2bf95a372842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679372e54c59c5cf67931b12b9833e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dee31f4232c17e93e3636eebe1af1ea.png)
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【推荐2】如图,在圆内接四边形
中,
为
的直径,点D关于
的对称点E在边
上,连接
并延长
交
于点G,圆心O在
上,过点D作
.
为
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44db8d7bd585ca42f1b32d3d31aa47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152d640527dc176169ac2418761f7e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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