已知,如图在等边
中,点
为
边上一点,点
为
边上一点,连接
并延长
交
延长线于点
,过点
作
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/2/2669287177633792/2671504956137472/STEM/1861463f-7af8-4637-bb28-66365ad41190.png)
(1)求证:
;
(2)当
时,试判断以
为顶点的三角形的形状,并说明理由;
(3)当点
在线段
上运动时,试探究
与
的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ed4d350ae85e9ad5615e33e2af739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c13ab7f17263c4e6163d960f1c5060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2021/3/2/2669287177633792/2671504956137472/STEM/1861463f-7af8-4637-bb28-66365ad41190.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494bf14f8369edcb5ba24413e91fd473.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462c1819fe75d3c7bf1c628075f404d1.png)
(3)当点
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
更新时间:2021-03-05 20:13:39
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,BD是△ABC的中线,CE⊥BD于点E,AF⊥BD,交BD的延长线于点F.
(1)试探索BE,BF和BD三者之间的数量关系,并加以证明;
(2)连接AE,CF,求证:AE∥CF.
(1)试探索BE,BF和BD三者之间的数量关系,并加以证明;
(2)连接AE,CF,求证:AE∥CF.
![](https://img.xkw.com/dksih/QBM/2018/6/21/1971996642320384/1972929212751872/STEM/2fd6406fbd9a4a028028962000fcc6f0.png?resizew=195)
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名校
【推荐2】已知,在
中,
点
为
的中点.
问题发现
如图①,若点
分别是
的中点,连接
则线段
与
的数量关系是 ___ _,线段
与
的位置关系是 ___ _;
拓展探究
如图②,若点
分别是
上的点,且
连接
上述结论是否依然成立?若成立,请给出证明;若不成立,请说明理由;
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211409137664/2462311265460224/STEM/c359fb2c-abef-4ef8-bf75-f0b8bba74060.png)
解决问题
当点
分别为
延长线上的点,且
连接
直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2232a9a05712846d40b747a51b94d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
如图①,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0e845fa23e9e3828d450967d65eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0c12379ff58d8ddf66547d7a873baf.png)
如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00d36a80825a38dae7b37d06257509b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0e845fa23e9e3828d450967d65eed.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211409137664/2462311265460224/STEM/c359fb2c-abef-4ef8-bf75-f0b8bba74060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a416e351c08669214734418cf60209e.png)
当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7597689c29b7021fbf0aefc3c2585b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a567c99f7b71aa5fda3a79639a65bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0e845fa23e9e3828d450967d65eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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【推荐1】如图,在等腰直角△ABC中,
,P是线段BC上一点,连接AP,延长BC至点Q,使得
,过点Q作
于点H,交AB于点M.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646620749824/2972050630500352/STEM/0d45f6f1-b72c-492f-b291-0975fe77b8f4.png?resizew=185)
(1)若
,
,直接写出线段AB的长.
(2)若
,求∠AMQ的大小(用含a的式子表示).
(3)用等式表示线段MB与PQ之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7210c2fbdb84b991377bf492e29cd8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d3bfa5421c8a6a44e59f2496113fab.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646620749824/2972050630500352/STEM/0d45f6f1-b72c-492f-b291-0975fe77b8f4.png?resizew=185)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b341825e95f3e2de8670370ed38ac9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60f7441172407b19e9e61b85a0170d1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a45e8836360bfd88f156e55fdf9c46.png)
(3)用等式表示线段MB与PQ之间的数量关系,并证明.
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名校
【推荐2】【问题发现】如图①,在
中,
,将
绕点
逆时针旋转
得到三角形
,连接
,
_______
,
______(用含
的代数式表示);
【问题探究】如图②,已知
是边长为
的等边三角形,以
为边向外作等边
,点
为
内一点,连接
,将线段
绕点
逆时针旋转
,得到线段
,点
的对应点为点
,连接
,
,求证:
;
【结论应用】如图③,在【问题探究】的条件下,连接
,
,
的最小值为____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2272417e6fe9065517fb3061013a3563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa8e0c8db19a6c367fb850c71f329c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b72af6c45db631d044e6e89cbc22e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aab04d7b9e668cbf9bd2b3ffcdaca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
【问题探究】如图②,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28b6ebc66cac78259b30c49fe645943.png)
【结论应用】如图③,在【问题探究】的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/e17f6863-e9d9-4db7-81f0-9e3ab118c9c3.png?resizew=466)
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【推荐3】若一条直线经过三角形的一个顶点,且将这个三角形的周长分成相等的两部分,则称这条直线为该三角形的等分线,等分线被这个三角形截得的线段称为该三角形的截径.例如等腰三角形底边上的中线即为它的截径.
(1)若等腰三角形
中,
,过点
的截径长为3,则
.
(2)如图1,四边形
中,
为边
上一点,
,
,过点
作
于点
,求证:直线
为
的等分线;
(3)如图2,
中,
,
,
为
的等分线,
是边
的中点,在
边上求作一点
,使
为
的等分线;
①按题意补全图形(要求:尺规作图,保留作图痕迹,不写作法)
②若
的面积为
,
的面积为
,试直接写出
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/19/b11fe1ce-036a-416f-bfdf-bebbd4571cdd.png?resizew=372)
(1)若等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c66f04250c74c6ec60e7b3abdf67c215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2291de85a2a29ff360a4515cce99c804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bb0405afa96ebf94c5b03fd52763dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
①按题意补全图形(要求:尺规作图,保留作图痕迹,不写作法)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a861406a1c1f251aa4df7226c60ce125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1269ea1057c555e256a8ea4a717e0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a025f648f3051e60bb8924dc0bfb313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
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解答题-作图题
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【推荐1】如图,已知平行四边形ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/e5fae218-e6cd-4de4-b515-6303bcc7d517.png?resizew=160)
(1)用直尺和圆规作出∠ABC的平分线BE,交AD的延长线于点E,交DC于点F(保留作图痕迹,不写作法);
(2)求证:△ABE是等腰三角形;
(3)在(1)中所得图形中,除△ABE外,请你写出其他的等腰三角形.(不要求证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/e5fae218-e6cd-4de4-b515-6303bcc7d517.png?resizew=160)
(1)用直尺和圆规作出∠ABC的平分线BE,交AD的延长线于点E,交DC于点F(保留作图痕迹,不写作法);
(2)求证:△ABE是等腰三角形;
(3)在(1)中所得图形中,除△ABE外,请你写出其他的等腰三角形.(不要求证明)
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解答题-证明题
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【推荐2】如图,在
中,
于点C,E为
上一点,连接
的延长线交
于点F,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/f2d49dbd-5c3a-4107-aed0-899c2b00a7fd.png?resizew=209)
(1)求证:
;
(2)
_____
;(填位置关系,这个结论可以直接用于证明过程)
(3)利用图中阴影部分面积完成勾股定理的证明:已知:如图,在
中,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf89b35700e248c37d4e67b84708055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b0e1c25a90fe1a83dc8b201b78d9c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/f2d49dbd-5c3a-4107-aed0-899c2b00a7fd.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dff09ef655b39f25d7c7553c9dcc5d3.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)利用图中阴影部分面积完成勾股定理的证明:已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2200c1a60fb6e3f2fbd58b1c0465a9ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133ef62aad6bdd6637140620f068fad.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图1,在△ABC中,AB=AC,点E为边AB上一点,连接CE.
(1)如图1,以CE为边作等腰三角形DCE,DE=DC,连接AD,且满足条件AB⊥AD,∠B=∠ADE,∠ACD=3∠B,求证:DE⊥DC.
(2)如图2,∠BAC=120°,过点A作直线AM⊥BC交BC于点M,点F为直线M上一点,BE=AF,连接CF,当CE+CF最小时,直接写出∠ECF的度数.
(1)如图1,以CE为边作等腰三角形DCE,DE=DC,连接AD,且满足条件AB⊥AD,∠B=∠ADE,∠ACD=3∠B,求证:DE⊥DC.
(2)如图2,∠BAC=120°,过点A作直线AM⊥BC交BC于点M,点F为直线M上一点,BE=AF,连接CF,当CE+CF最小时,直接写出∠ECF的度数.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848062368022528/2849495005110272/STEM/2b45572f-ee50-40dc-bb0e-1b6db2b0aa97.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在平行四边形
中,
,
的平分线交
于点
,交
的延长线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804338423619584/2804545334370304/STEM/9ff1dea5-bc30-426a-a2de-014e0ea15aac.png)
(1)求证:
是等边三角形,
(2)若
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804338423619584/2804545334370304/STEM/9ff1dea5-bc30-426a-a2de-014e0ea15aac.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983d4402fddd33c1cc85ebc1711d2c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次