如图,△ABC中,AB=AC,AD、CD分别是△ABC两个外角的平分线.
(1)求证:AC=AD;
(2)若∠B=60°,求证:四边形ABCD是菱形.
(1)求证:AC=AD;
(2)若∠B=60°,求证:四边形ABCD是菱形.
![](https://img.xkw.com/dksih/QBM/2011/7/19/1573224928305152/1573224994668544/STEM/15e83a96-b1a5-4b66-9624-e7a860928083.png?resizew=204)
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更新时间:2019-01-30 18:14:09
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,
,
是
的平分线,
是
的平分线,且
.
求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/7fcf4242-22f7-4a66-a51e-4ac22719e7a6.png?resizew=160)
证明:∵
是
的平分线,
∴
______.
∵
是
的平分线
∴
______.
∵
,
∴______.
又∵
,
∴______.
∴______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb34d917a073024625616e4edf22016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3139e28714bfc3d5d875d78dd245d2e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/7fcf4242-22f7-4a66-a51e-4ac22719e7a6.png?resizew=160)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345197029bf99ba296bb5fc36222e2c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38011a315de7ee360444933850a015a1.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb34d917a073024625616e4edf22016.png)
∴______.
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3139e28714bfc3d5d875d78dd245d2e.png)
∴______.
∴______.
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解答题-问答题
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适中
(0.65)
【推荐2】如图,已知直线
分别交
,
于点
,
,且
,
的平分线与
的平分线相交于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718864463814656/2790478921990144/STEM/40a8c5f2-9923-4934-acfb-d32b6682e2c2.png?resizew=185)
(1)求
的度数;
(2)若直线
//
,请你判断线段
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45a193b98c7a98ab53d39ed3dfed2ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718864463814656/2790478921990144/STEM/40a8c5f2-9923-4934-acfb-d32b6682e2c2.png?resizew=185)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d31cb19d4833eec524dc1d0bfdf97fc.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
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解答题-证明题
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适中
(0.65)
【推荐1】请仔细阅读以下材料:
定理一:一般地,如图,四边形
中,如果连接两条对角线后形成的
,则
四点共圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0b3356ba-34bd-45f0-88e6-9c7d4ed93161.png?resizew=159)
我们由定理可以进一步得出结论:
,
,
.
定理二:直角三角形斜边上的中线等于斜边的一半.
温馨提示:下面问题的关键地方或许能够用到上述定理,如果用到,请直接运用相关结论;如果你有自己更好的做法,那就以自己的做法为主,只要正确,一样得分.
探究问题:如图,在
和
中,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0c7e56c1-538f-416a-b2d0-e6181d1d7163.png?resizew=226)
,
,
,连接
交于点
,
交
于点
,连接
.
(1)求证
;
(2)请直接写出
___________度,
___________度;
(3)若
,求证
.
定理一:一般地,如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca61f08915e5bd5d9581cb90894e2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0b3356ba-34bd-45f0-88e6-9c7d4ed93161.png?resizew=159)
我们由定理可以进一步得出结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8a6bccd493e0f8ed88e1e5ac720727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1bddb5741fa3bbbeb50af9f786131f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787f2c81637ae0e6fab9b02b6801e821.png)
定理二:直角三角形斜边上的中线等于斜边的一半.
温馨提示:下面问题的关键地方或许能够用到上述定理,如果用到,请直接运用相关结论;如果你有自己更好的做法,那就以自己的做法为主,只要正确,一样得分.
探究问题:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0c7e56c1-538f-416a-b2d0-e6181d1d7163.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a539a0930da7556594dd365878402d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ca9e4bffed93f705758ba54f32a0e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a223745de1924422cf0b0974d06597f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a2e63e2e76266d606946a11c1d75de.png)
(2)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb663fe83b1f7e93e13d91cc6460f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62491513852e65f93c804105c2af5920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3309d027d6e7dc3ae47cf1ef5ca4ec.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图1,在
中,
,点D在
延长线上,点E在
上,连接
,使
.
相等的角为:________;
(2)判断
与
之间的数量关系,并说明理由;
(3)如图2,
的角平分线
交
于点G,交
于点F,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84436aa1ceaa333f6236c35b6eb63ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b8589dafca294fe3334ebba850b40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3594d3706cca354213374da605893475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/5f14efa079527ee8b19155ad7d85e894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ea431baba79c12af96eb31a5abe773.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在矩形
中,
,
,
的垂直平分线
分别交
,
于点
,
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/459d5304-9f12-4465-a8b8-6db94ef42b93.png?resizew=188)
(1)连接
,
,求证:四边形
为菱形;
(2)求
的长及菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f83b02dc7659d7fdad5771da6996d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1ac2dff9763044e787ebe877b4a142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/459d5304-9f12-4465-a8b8-6db94ef42b93.png?resizew=188)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
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解答题-作图题
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适中
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真题
【推荐2】如图,
与
相交于点
,
,
.
;
(2)用无刻度的直尺和圆规作图:求作菱形
,使得点M在
上,点N在
上.(不写作法,保留作图痕迹,标明字母)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0175dc2b94c0825fc250da0a2ba648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/decd02bb1fd6ac5a3610a279fe96212b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528fa89492fc43b433557508fff7a19a.png)
(2)用无刻度的直尺和圆规作图:求作菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e649a9ac971bc37db8780ab0c1a0d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次