已知:如图,锐角△ABC.
![](https://img.xkw.com/dksih/QBM/2021/6/3/2734963390816256/2736341794570240/STEM/39052d92-c62a-4a40-a071-1d14107d985b.png)
求作:在AB上取点D,AC上取点E ,使得
,作法:
①分别以点B和点C为圆心,大于
长为半径画弧,两弧相交于点M、N,作直线MN,交BC于点O;
②以点O为圆心,OB长为半径画圆,在BC上方交AB于点D,交AC于点E;
③连接
,
即为所求作
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明
证明:∵点B、C、E、D均在
上.
∴
()(填推理依据).
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2fdea5800c2a47e4f1cdf3305f86e7.png)
∴
.
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3663c982e3e0b913d59c083819baf17f.png)
∴
![](https://img.xkw.com/dksih/QBM/2021/6/3/2734963390816256/2736341794570240/STEM/39052d92-c62a-4a40-a071-1d14107d985b.png)
求作:在AB上取点D,AC上取点E ,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4052f9766e542f95e3c9d15acc14930a.png)
①分别以点B和点C为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
②以点O为圆心,OB长为半径画圆,在BC上方交AB于点D,交AC于点E;
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccbf98ff1b1f121ee3aa3dec108ba0c.png)
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明
证明:∵点B、C、E、D均在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b729d3b5e018129fde0e3c4ce43676f2.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2fdea5800c2a47e4f1cdf3305f86e7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ef38925946da1145a68651da67da9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3663c982e3e0b913d59c083819baf17f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4052f9766e542f95e3c9d15acc14930a.png)
更新时间:2021-06-05 10:44:32
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解答题-作图题
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【推荐1】如图,在△ABC中,AB>AC,请用尺规作图法,在BC边上求作一点P,使得AP=PB.(保留作图痕迹,不写作法)
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【推荐2】如图,在
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①分别以点A、B为圆心,以大于
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②以点A为圆心,任意长为半径作弧,分别与
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(1)通过以上作图,可以发现直线
是______,射线
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A.线段
的垂直平分线 B.
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(2)在(1)所作的图中,求
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①分别以点A、B为圆心,以大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
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②以点A为圆心,任意长为半径作弧,分别与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)通过以上作图,可以发现直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(2)在(1)所作的图中,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
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解答题-问答题
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)若
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解答题-证明题
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【推荐1】如图,在
中,
,以
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,交
于点
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,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/c11dc6c0-736f-4027-ad32-78925cba545f.png?resizew=132)
求证:(1)点D是
的中点.
(2)
.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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求证:(1)点D是
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(2)
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【推荐2】如图,将矩形纸片
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;
(2)若
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/951b483c-f2b2-4bc4-83eb-062d8a119e67.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/979097265dc891d2c1bef3967d89fc8a.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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