如图,在Rt
ABC中,∠B=90°,直线ED是AC的垂直平分线,交AC于点D,交BC于点E.已知∠BAE=20°.求∠C的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869592186380288/2871682675466240/STEM/c27e2f44-4645-484a-86a8-8fc99a68f347.png?resizew=252)
更新时间:2021-12-13 15:56:16
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【推荐1】我们定义:在一个三角形中,若一个角的度数是另一个角度数的3倍,则这样的三角形称之为“美好三角形”,如:三个内角分别为
,
,
的三角形是“美好三角形”.
如图,
,点C在边
上,过点C作
交
于点E,以C为端点作射线
,交线段
于点F(点F不与O,E重合)
【概念理解】(1)
的度数为_________,
_________(填“是”或“不是”)“美好三角形”.
【应用拓展】(2)若
,试说明:
是“美好三角形”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c211a24e544ded208ea0a2a2aa59bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab274af3fbc308c9de2dffb8a30a9bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/8b1524ee-97fa-4281-97f1-ef30b31106b7.png?resizew=163)
【概念理解】(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daebc8ac27b32eb46881840ea3da59f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb6772cca18f6f1cfb7c961a425c8b2.png)
【应用拓展】(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61092757be41977cd4fca993c8a0251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20bb77c849e0ce2a7d06ff0ca900fb28.png)
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【推荐2】如图,
、
、
三点在同一水平线上,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/4/25/3224356034347008/3224734530158592/STEM/72d4e210f9ac4454b34e376f67f32bd4.png?resizew=132)
(1)求
的度数;
(2)求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b30bca5d706eb899b4a5479fa3dca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b3f267eee935183f708c4a68204718.png)
![](https://img.xkw.com/dksih/QBM/2023/4/25/3224356034347008/3224734530158592/STEM/72d4e210f9ac4454b34e376f67f32bd4.png?resizew=132)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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【推荐1】如图,
,点E是线段
上一点,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/8a50538b-23d6-4007-b761-c1474b71dbe8.png?resizew=199)
(1)若
,
,求
的度数.
(2)猜想
、
和
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/8a50538b-23d6-4007-b761-c1474b71dbe8.png?resizew=199)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b3e43181f751f4040621d0eb9eb58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064afd84107907b982a70e83282193b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a71e8a816d9ef65d4bffd81fd53216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
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【推荐2】如图,在
中,
平分
,点E在
的垂直平分线上,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/300ca17a-2863-4f54-a415-f3524ff4b0c2.png?resizew=186)
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【推荐1】如图,在
中,
是
边上的高线,
的垂直平分线分别交
,
于点
,
.
(1)若
,求
的度数;
(2)试判断
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f577f43587d15de5f7102839e162f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f7e1c0456e86eee4f22e913a1a5778.png)
(2)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645325132824576/2664265385000960/STEM/553cf9f2-088f-4828-b2b7-2e7fa5ff6971.png?resizew=232)
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【推荐2】如图,在△ABC中,BC=36.DG,EF分别垂直平分AB,AC,垂足分别为G,F,求△DAE的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/b8ac8174-7836-4dd6-8c73-3e7592b55ac9.png?resizew=165)
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【推荐1】如图,在平行四边形ABCD中,
的平分线与
相交于点
.求证:AD+BE=AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968681134112768/2971619950460928/STEM/a811c352-436e-48f0-b136-733d8462035f.png?resizew=213)
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【推荐2】如图,已知在
中,
,
为
内一点,
,试说明
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e8cfe49f2818c8e3cf7e47c040b78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2ba742a343597d9066e775ae9f88d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/1b0f16bb-f585-467b-98ef-df2a4c473eef.png?resizew=145)
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