“三等分角器”是利用阿基米德原理做出来的,如图,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1cce2463a0d6f40dc74a35a671e11ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e66fb513d0f04dd6a78cd28755a408.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/8bf3a048-c154-4a71-b115-13f7b480a58d.png?resizew=208)
更新时间:2023-01-13 21:04:25
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解答题-作图题
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【推荐1】如图,已知
,
,
.请用尺规作图法,在
边上求作一点P,使
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da34cf9e12ae21e20af861a581ca0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735bd70c2fa2bf51fd7aa448b20d0be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0deaba089f49bb958b4b05064cf29694.png)
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解答题-问答题
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【推荐2】如图,在
中,
是
的角平分线,作
交
于点
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8a5b476e7bc3345e2a91f31aae372d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661c7ecd1d53da8559a052d6b0f51b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://img.xkw.com/dksih/QBM/2021/8/17/2788283449376768/2796079872786432/STEM/f50d0d4a-dcd6-4e4f-a934-5fb1f3990e9b.png)
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解答题-问答题
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【推荐1】如图,在
中,
,点D为
延长线上一点,
交
的延长线于点E,点F为
延长线上一点,
交
的延长线于点H,且
.
![](https://img.xkw.com/dksih/QBM/2023/1/7/3147712197926912/3149185779310592/STEM/004a18ec5cc34329af62b1b7a514f577.png?resizew=182)
(1)
与
全等吗?为什么?
(2)连接
交
于点P,若
,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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7044476eb6e90a781518c230f4637bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4c4af6cbe9dcc8562f48a087cb60d4.png)
![](https://img.xkw.com/dksih/QBM/2023/1/7/3147712197926912/3149185779310592/STEM/004a18ec5cc34329af62b1b7a514f577.png?resizew=182)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beec023ec3ee72d98f728fd79374968.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
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解答题-证明题
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【推荐2】如图,在
中,
,点D为AB边上的一点且
,过点B作CD的平行线BE,且
于点E,连接DE.
(1)求证:BC平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
(2)若
,
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b7513e09cccf40c3a483064b97e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133f14539e3090e18427017ff212d933.png)
(1)求证:BC平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/2020/11/11/2590619266588672/2592025122816000/STEM/da3854d987174ba2a1b4a417e4745b59.png?resizew=147)
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