如图,在
中,点D,E分别是
,
的垂直平分线与
的交点.
(1)若
的长为6,求
的周长;
(2)若
,求
的度数;
(3)若
(
为锐角),求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/f58955c5-6ec7-4e90-a862-930c875202ee.png?resizew=209)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313dc97007d1d8379c77acfde9e6f818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9cd3d8e6059030fb2cbfb62c791faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
更新时间:2023-08-07 09:01:03
|
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解答题-作图题
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名校
【推荐1】小王在学习过程中发现了一个命题:“如果三角形一边上的中线等于这条边的一半,那么这个三角形是直角三角形”,请按要求解决下列与此命题有关的问题.
(1)请用无刻度的直尺与圆规作出线段
(如图)的中点
,在以
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,连接
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,连接
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(2)结合(1)中画出的图形,用符号表示此命题中的已知与求证,并给出证明.
已知:____________.
求证:
是直角三角形.
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/31dcd6df-c59e-4b6a-88f9-1dba965b654f.jpg?resizew=163)
(1)请用无刻度的直尺与圆规作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)结合(1)中画出的图形,用符号表示此命题中的已知与求证,并给出证明.
已知:____________.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
证明:
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【推荐2】如图,∠B=∠C=∠BAE,∠AEC=∠EAC,AD⊥BC,求∠DAE.
![](https://img.xkw.com/dksih/QBM/2019/11/6/2328133343100928/2331085344317440/STEM/a9f9a91b13fa4fbebe522add9cadf33d.png?resizew=228)
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解答题-作图题
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【推荐1】在如图的网格中建立平面直角坐标系,
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![](https://img.xkw.com/dksih/QBM/2021/6/9/2739534436851712/2744229954715648/STEM/7220323e-bd50-49f0-bec5-1f7b7da042c1.png)
(1)直接写出
的形状:
(2)画出
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(3)在(2)的基础上,在
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(4)在(2)、(3)的基础上,线段
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f026f0e3b4d26f28127e03aa4c92c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e88d726b4b2e4b54667da2b5851672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e92800c8a8cf3ab792ab9e61b8fb35.png)
![](https://img.xkw.com/dksih/QBM/2021/6/9/2739534436851712/2744229954715648/STEM/7220323e-bd50-49f0-bec5-1f7b7da042c1.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884e4bec1a5258d57d8084893d6989bb.png)
(3)在(2)的基础上,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f022b18f3b30bccee515df5e47ff00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5624441a65fdbc821e5f6166c6850845.png)
(4)在(2)、(3)的基础上,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ac8c5700ce2de9a140c4adea742168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9806df6df27bf715c81c4a93fc6517c5.png)
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解答题-作图题
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真题
【推荐2】如图,
是五边形
的一边,若
垂直平分
,垂足为
,且____________,____________,则____________.
给出下列信息:①
平分
;②
;③
.请从中选择适当信息,将对应的序号填到横线上方,使之构成真命题,补全图形,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
给出下列信息:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐1】如图,
是
的直径,
为
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于
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/94677366-d6f5-45f1-beec-2bcb973b82df.png?resizew=141)
(1)求证:
;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/94677366-d6f5-45f1-beec-2bcb973b82df.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd8d665f2ccf60a71345010a930924d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf0d8f935e72a45b9f8aeab31170921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】如图,将
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(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327769446ffde2076a9840c78a13959d.png)
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