如图,
是
的内接三角形,且
为直径.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f526fa49-0a72-4c4e-b11d-23ea45469a93.png?resizew=155)
(1)请用尺规作
的平分线,交
于点
;(不要求写作法,但需要保留作图痕迹)
(2)连接
,
,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/2024/3/3/f526fa49-0a72-4c4e-b11d-23ea45469a93.png?resizew=155)
(1)请用尺规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2024-03-03 16:08:15
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在四边形
中,
,
.
上截取
,连接
,作
的角平分线
,分别交
于点F、G,连接
.(保留作图痕迹,不写作法)
(2)在(1)所作图形中,求证:
.(请补全下面的证明过程,不写证明理由)
证明:∵
是
的角平分线,
∴ ,
∵
,
∴ ,
∴
,
∴ ,
又∵
,
∴ ,
∴四边形
是平行四边形,
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a626eb07074f222d52c129b275e173d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6fb62038b9207669ce6f8309fb142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(2)在(1)所作图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d440215e4ca391884e61b1017e329e4.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
∴ ,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
∴ ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a40e29b48b7a23bc25eb615bbe5f5d.png)
∴ ,
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
∴ ,
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7419886f571571b57b61a6a8980305e8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d440215e4ca391884e61b1017e329e4.png)
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解答题-作图题
|
适中
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名校
【推荐2】如图,已知点M是
的外心,在
的外部找一点D,使得点D到射线
和射线
距离相等,且
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/4da2a551-ec43-4cf0-b49c-29fef9b6a267.png?resizew=182)
(1)请用尺规作图的方法确定点D的位置(不写作法,保留作图痕迹);
(2)若
,求线段
的长.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61318f92c8f9ea2945b8988b84bd492.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/4da2a551-ec43-4cf0-b49c-29fef9b6a267.png?resizew=182)
(1)请用尺规作图的方法确定点D的位置(不写作法,保留作图痕迹);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2328312c8c92ce1cbbd154e44f6ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,E是
的内心,
的延长线与
的外接圆
相交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/ae4acde6-eea0-42c2-96e0-399c4aba7ce7.png?resizew=136)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/ae4acde6-eea0-42c2-96e0-399c4aba7ce7.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f94cb32b388456ab9203e8d8b5309e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13171ee1bcd5648ed7c5ad56dd63942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb08995612c015c69fd52e7ab56466c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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,在等腰△ABC中,AB=BC,以AB为直径的半圆分别交AC、BC于点D、E两点,BF与⊙O相切于点B,交AC的延长线于点F.
(1)求证:D是AC的中点;
(2)若AB=12,sin
∠CAE=
,求CF的值.
(1)求证:D是AC的中点;
(2)若AB=12,sin
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183684776230912/2185346537619456/STEM/1270d9d2d02f4c1db061aab3fdad9125.png?resizew=5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183684776230912/2185346537619456/STEM/25de3b6e6c50466aba2833785e464195.png?resizew=80)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】在四边形ABCD中,P为CD边上一点,且△ADP∽△PCB,分别在图①和图②中用尺规作出所有满足条件的点P.(保留作图轨迹,不写作法)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3e955c18-c4b8-46bb-9e2e-6a13f2e9798c.png?resizew=426)
(1)如图①,四边形ABCD是矩形;
(2)如图②,在四边形ABCD中,∠D=∠C=60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3e955c18-c4b8-46bb-9e2e-6a13f2e9798c.png?resizew=426)
(1)如图①,四边形ABCD是矩形;
(2)如图②,在四边形ABCD中,∠D=∠C=60°.
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解答题-证明题
|
适中
(0.65)
【推荐2】以△ABC的边AC为直径的半圆交AB边于D点,∠A、∠B、∠C所对边长为a、b、c,且二次函数y=
(a+c)x2-bx+
(c-a)顶点在x轴上,a是方程z2+z-20=0的根.
(1)证明:∠ACB=90°;
(2)若设b=2x,弓形面积S弓形AED=S1,阴影面积为S2,求(S2-S1)与x的函数关系式;
(3)在(2)的条件下,当BD为何值时,(S2-S1)最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)证明:∠ACB=90°;
(2)若设b=2x,弓形面积S弓形AED=S1,阴影面积为S2,求(S2-S1)与x的函数关系式;
(3)在(2)的条件下,当BD为何值时,(S2-S1)最大?
![](https://img.xkw.com/dksih/QBM/2020/5/15/2463099981463552/2463800818458624/STEM/73e645f8522e47beabfe1d6f1d7ab606.png?resizew=153)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,已知
内接于
,
是直径,点
在
上,
,过点
作
,垂足为
,连接
交
边于点
.
(1)求证:
∽
;
(2)求证:
;
(3)连接
,设
的面积为
,四边形
的面积为
,若
,求
的值.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/8b391191077e41d28f126cbd668ae7ee.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/62ace87f247c4a51844801e6a55faeef.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/352090715d374bd586c2da4ea7fa830f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/c101748f21ad456497f7a56b2b526df1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/62ace87f247c4a51844801e6a55faeef.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/a8424c50198943d3b11da31716789cc8.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/c101748f21ad456497f7a56b2b526df1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/e2c5e53f7a554e11a3f9eb73072cca9f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/ac926fdda3b2425a93d4ea41b0ad5b96.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/fae3fc43846946ed82b23c2c76adaf37.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/5a833b030e7f40b5aa42164e0dfc65c9.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/cedcf8eb43064e4788f7e2aaf3782bd7.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/7d9677d34c1f47f68e2e586a761ff45b.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/8b391191077e41d28f126cbd668ae7ee.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/95bbda34e964467da4f535ac15144614.png)
(3)连接
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/66690324597444fcbee9d1498320451a.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/7d9677d34c1f47f68e2e586a761ff45b.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/7383214e53a545d5a8d35d444afae91e.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/7f949ade9da244b3b4317b9db0924d7f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/f605ef33a0ed416fac96e653fc538510.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/83fc5b4ef7fb4a86a73f9a6b292be5c4.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/83280a1452ad441f98815d3a9b47269d.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773761759895552/1773761760395264/STEM/ad5b8ae84cb14a74b95461fd49e81524.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】某校数学活动小组在一次活动中,对一个数学问题作如下探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/49a0de29-6db2-4039-85f5-db3e2e3500e0.jpg?resizew=485)
(1)问题发现:如图
,在等边
中,点
是边
上任意一点,连接
,以
为边作等边
,连接
,
与
的数量关系是 ___________;
(2)变式探究:如图
,在等腰
中,
,点
是边
上任意一点,以
为腰作等腰
,使
,
,连接
,判断
和
的数量关系,并说明理由;
(3)解决问题:如图
,在正方形
中,点
是边
上一点,以
为边作正方形
,
是正方形
对角线的交点,连接
.若正方形
的边长为
,
,求正方形
的边长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/49a0de29-6db2-4039-85f5-db3e2e3500e0.jpg?resizew=485)
(1)问题发现:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259433285d207df95d21667a4cc3c40c.png)
(2)变式探究:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834c5dd2c851131fd870d32d777c757b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac236a1d0320497a319129dd6c0cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259433285d207df95d21667a4cc3c40c.png)
(3)解决问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85125122c8c0c96a3db50b80ad06d360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85125122c8c0c96a3db50b80ad06d360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85125122c8c0c96a3db50b80ad06d360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
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