如图,内接于
,
为
的直径,
,
交
于点P,
,
.
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3ae0ac1cd4e5221eb8be9463c166a2.png)
(2)在(1)的条件下,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19816396837aec6aa044a1428e0825d.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f02028a3847c4807c2d3cf0ea7efb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd6ec8fa1147280a0eaba74744b2d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
更新时间:2024-03-21 15:20:41
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相似题推荐
解答题-证明题
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名校
【推荐1】在
中,
,F为AB延长线上一点,点E在BC上,且
.
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366354587230208/2367139372621824/STEM/6c4acfbd70cd4ffd930134b3fa06ddef.png?resizew=229)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59c0342edb828b0aeb194b09631c6ef.png)
(2)若
,求
度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20ab738647e4153c2f989f2cdb96b1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366354587230208/2367139372621824/STEM/6c4acfbd70cd4ffd930134b3fa06ddef.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59c0342edb828b0aeb194b09631c6ef.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963640fa2d2dad37a5d762d95b7abc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
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适中
(0.65)
【推荐2】如图所示,在
中,
,点
分别在
上,且
与
交于点 F.
是等边三角形;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fbe188222b86447706a6ba8366d825.png)
(3)求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89cf6bb35d9191f23e76c540f6ff7a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf021aeca0c3cacd4bbffd7479a1e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ffa3f397b0f9f0bdda56a07b5c3ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fbe188222b86447706a6ba8366d825.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
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【推荐1】如图,在平行四边形ABCD中,∠ABC,∠BCD的平分线分别交AD于点E,F,BE,CF相交于点G.
(1)求证:BE⊥CF;
(2)求证:AF=DE.
(1)求证:BE⊥CF;
(2)求证:AF=DE.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724184868298752/2789395625779200/STEM/ce1324a348f5437d83da1b9385971f7e.png?resizew=165)
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【推荐2】如图,已知AB是⊙O的直径,⊙O交△ABE边AE于点D,点P在BA的延长线上,PD交BE于点C.现有3个选项:①AB=BE,②PC⊥BE,③PD是⊙O的切线.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988485316616192/2989926085476352/STEM/2482a808-449e-4c1c-aa44-35be61503f60.png?resizew=178)
(1)请从3个选项中选择两个作为条件,余下一个作为结论,得到一个真命题,并证明;你选择的两个条件是 ,结论是 (只要填写序号);
(2)在(1)的条件下,连接OC,如果PA=2,sin∠ABC=
,求OC的长.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988485316616192/2989926085476352/STEM/2482a808-449e-4c1c-aa44-35be61503f60.png?resizew=178)
(1)请从3个选项中选择两个作为条件,余下一个作为结论,得到一个真命题,并证明;你选择的两个条件是 ,结论是 (只要填写序号);
(2)在(1)的条件下,连接OC,如果PA=2,sin∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
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【推荐1】如图,
为
的直径,且
,
的平分线交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701078877372416/2705862478176256/STEM/75728599-e0f9-4979-9acb-d8d74e20deeb.png)
(1)求
的长;
(2)
平分
交
于点
.
①求证:
;
②若弦
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701078877372416/2705862478176256/STEM/75728599-e0f9-4979-9acb-d8d74e20deeb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
②若弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-证明题
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(0.65)
【推荐2】如图1,⊙O是
的外接圆,
是直径,
,
交⊙O于点E,且
.
(1)求证:
是⊙O的切线;
(2)若点E为线段
的中点,判断以O、A、C、E为顶点的四边形的形状并证明;
(3)如图2,作
于点F,连接
交
于点G,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbab840d528f4ce7a9ef87e8446f84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/717fe03d431e0ef57266a42cf35bb35f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/8699e8be-c9a5-40ed-81fc-652376205138.png?resizew=385)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若点E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(3)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6e90f14ab547046202da4193e376d3.png)
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【推荐1】如图,点C在以AB为直径的⊙O上,BD平分∠ABC交⊙O于点D,过D作BC的垂线,垂足为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/74868158-d7d4-4c2c-8ef7-8807655f9867.png?resizew=165)
(1)求证:DE与⊙O相切;
(2)若AB=5,BE=4,求BD的长;
(3)你能发现线段AB,BE和CE之间的数量关系吗?请写出结论,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/74868158-d7d4-4c2c-8ef7-8807655f9867.png?resizew=165)
(1)求证:DE与⊙O相切;
(2)若AB=5,BE=4,求BD的长;
(3)你能发现线段AB,BE和CE之间的数量关系吗?请写出结论,并说明理由.
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解答题-证明题
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【推荐2】如图,在平行四边形ABCD中,M为对角线AC上一点,BM的延长线交AD于点N,交CD的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2020/12/19/2624563439960064/2630461655982080/STEM/34204566-4925-4292-a049-832e84921950.png)
(1)请找出一对相似的三角形并证明;
(2)若
,
,求BE的长.
![](https://img.xkw.com/dksih/QBM/2020/12/19/2624563439960064/2630461655982080/STEM/34204566-4925-4292-a049-832e84921950.png)
(1)请找出一对相似的三角形并证明;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f772c1a30e9764e0bad6bbc6b9ff9d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3699139ef137f5053d121cd22a653ebe.png)
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