如图,△ABC中,∠C=90°,AD是△ABC的角平分线,DE⊥AB于E,AC=BE.
(1)求证:AD=BD;
(2)求∠B的度数.
(1)求证:AD=BD;
(2)求∠B的度数.
![](https://img.xkw.com/dksih/QBM/2019/5/29/2214017403035648/2214339301588992/STEM/b7b0598ff0cc4fb6939a722cf1797780.png?resizew=173)
更新时间:2019-01-03 10:35:34
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适中
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【推荐1】如图,
中,
,点
,
在边
上,
,点
在
的延长线上,
.
(1)求证:
;
(2)若
,求
的度数.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/d9ea66ad-b091-41a1-a6e0-19272e0e8330.jpg?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a14c9489a8475cfcaf629fc7e6f59e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
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【推荐2】如图,在
中,
,
,点D是线段
上任意一点,连接
,作
,
交线段
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/13949296-b546-4e44-88c2-a22f425360dd.png?resizew=167)
(1)若
,求
和
的度数;
(2)若
,求证:
.
![](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/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/13949296-b546-4e44-88c2-a22f425360dd.png?resizew=167)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66f960a3bcd33415c0541fe5778f9c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeb7d8bfd4877a9bd85b7cc69aec40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cda279d3cd75eeb603b14a3b94e420.png)
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【推荐1】已知,如图,在△ABC中,AB=8cm,AC=4cm,△BAC的平分线AD与BC的垂直平分线DG交于点D,过点D的直线DE⊥AB于点E,DF⊥AC于点F(或AC延长线)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8d657435-0c5c-4181-bded-9682ab7debc3.png?resizew=143)
(1)求证:AE=AF;
(2)求证:BE=CF;
(3)求AE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8d657435-0c5c-4181-bded-9682ab7debc3.png?resizew=143)
(1)求证:AE=AF;
(2)求证:BE=CF;
(3)求AE的长.
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解答题-证明题
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【推荐2】已知,如图,在
中,
,
是
的平分线,
于点E,F在
上,
.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b4c9fab3f6dc6f613f1d4d8a1bfc9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae27141fcb2cc54ea7513e280cdee956.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/14/0e342530-1631-486f-accd-6db3d547ee61.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4f063cbbc773cbf966bc82425ae839.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996578c2d04f694c640fa4a83f63538a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f112e992f9e0f9e8d6448a07de4d253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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解答题-作图题
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【推荐1】如图,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a2502c85974290003a7496b38e427b.png)
的角平分线
,交
于D;
(2)若
,
,直接写出
的长及
的面积.
的长为:__________;
的面积为:__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a2502c85974290003a7496b38e427b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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解答题-问答题
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【推荐2】如图,在四边形
中,
,E为
的中点,连接
、
,延长
交
的延长线于点F.
(1)求证:
;
(2)若
,说明
;
(3)在(2)的条件下,若
,
,
,求点E到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/1ae869ec-3249-4872-a1e2-cca450ab6eb8.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d824d850121cf020705046754c1240a5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7660397da21f66377e239a57e26d1c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d498c5bd6f0bc27ab2ebd2c003c666.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8832c5450a61500ccbf73d95e16f449.png)
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解答题-问答题
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【推荐1】(1)如图 1,如果
与直线
所成的锐角为
,以
为一边画等腰三角形,并且使另一个顶点
在直线
上,这样的等腰三角形能画_______个.
(2)如图 2,在
中,
,若存在过点
的一条直线,能把该三角形分成两个等腰三角形,试求
的度数.
(3)想一想:如图 3,
中,
,
,过顶点
作一条直线交线段
于点
, 直线
能把
分割出一个等腰三角形,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d02fa8edb0051f50e1eb14a11e6832d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5710f0ed62ff260474e5d3bc6069d665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d02fa8edb0051f50e1eb14a11e6832d.png)
(2)如图 2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a631226b2177fd5ef032b5767c9b3b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(3)想一想:如图 3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e56feb858a38f68412d4d7691fcf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/a45071eb-c9d1-40de-8a03-fecda9f460f4.png?resizew=497)
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【推荐2】如图,点O是等边
内一点,
.将
绕点C顺时针旋转
得
,连接
.
(1)求证:
是等边三角形;
(2)当
时,求
的长;
(3)当
是等腰三角形时,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc16b7796cac8eb8c15183f5312eb4c7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/11/ccd8f4cf-8349-4997-bb5d-bc31fbb723a0.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96bcaab1157f577919c7abc73a66ebd.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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