如图,AC是⊙O的直径,AB是⊙O的一条弦,AP是⊙O的切线,作BM=AB并与AP交于点M,延长MB交AC于点E,交⊙O于点D,连接AD.
(1)求证:AB=BE;
(2)若⊙O的半径R=2.5,MB=3,求AD的长.
(1)求证:AB=BE;
(2)若⊙O的半径R=2.5,MB=3,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/022905cb-8d10-45ae-b293-73f2ee1c5418.png?resizew=206)
更新时间:2020-05-15 21:30:21
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【推荐1】如图,△ABC是⊙O的内接三角形.AE是⊙O的直径,交BC于点G.过点A作AF⊥BC,AF分别与BC、⊙O交于点D、F,连接BE、CF.
![](https://img.xkw.com/dksih/QBM/2020/6/1/2475249345478656/2475549939335168/STEM/73b2011d4ece4d75beaa89782250426c.png?resizew=225)
(1)求证:∠BAE=∠CAF;
(2)若AB=8,AC=6,AG=5,求AF的长.
![](https://img.xkw.com/dksih/QBM/2020/6/1/2475249345478656/2475549939335168/STEM/73b2011d4ece4d75beaa89782250426c.png?resizew=225)
(1)求证:∠BAE=∠CAF;
(2)若AB=8,AC=6,AG=5,求AF的长.
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【推荐2】如图,
是
的内接三角形,
的角平分线
交
于点
,交
于点
,过点
作直线
.
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447144195760128/2447749806063616/STEM/f8a791225bb24cfd8c41b7df8e576060.png?resizew=115)
(1)判断直线
与
的位置关系,并说明理由;
(2)若在
上取一点
使
,求证:
是
的平分线;
(3)在(2)的条件下,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447144195760128/2447749806063616/STEM/f8a791225bb24cfd8c41b7df8e576060.png?resizew=115)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cbd1d4bdcf1199ec44f9ba5348ac42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐2】如图,
中,以
为直径的
交
于点
,
是
的切线,且
,垂足为
,延长
交
于点
.
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc67216733e4aa3fd8b4c776ef6eb6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
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【推荐1】如图,四边形ABCD内接于
,E为CD延长线上一点,
.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991433627320320/2992680169275392/STEM/34269f53-80b5-4b1a-9f9d-03d3cdc888a1.png?resizew=243)
(1)若
,试用含
的式子表示
;
(2)若AE是
的切线,
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d328b02462aa25a936d1c83eee4fb.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991433627320320/2992680169275392/STEM/34269f53-80b5-4b1a-9f9d-03d3cdc888a1.png?resizew=243)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c029e4ab80f8a2080d59ba73841f364f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)若AE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-作图题
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【推荐2】如图,已知在
中.
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689575754317824/2689634264940544/STEM/40132912-01f2-4fb1-89a8-28b9e01d3cb7.png)
(1)请用圆规和直尺作出
的内切圆⊙
:(保留作图痕迹,不写作法)
(2)若⊙
与
、
、
分别相切于点D、E、F,且
,
的周长为12,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689575754317824/2689634264940544/STEM/40132912-01f2-4fb1-89a8-28b9e01d3cb7.png)
(1)请用圆规和直尺作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若⊙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-证明题
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【推荐1】若一个三角形一条边的平方等于另两条边的乘积,我们称这个三角形是比例三角形.
(1)已知△ABC是比例三角形,AB=1,BC=2,求AC的长.
(2)如图1,在四边形ABCD中,AB=AD,对角线BD平分∠ABC,∠BAC=∠ADC
①求证:△ABC是比例三角形
②若AB∥DC,如图2,求
的值.
(1)已知△ABC是比例三角形,AB=1,BC=2,求AC的长.
(2)如图1,在四边形ABCD中,AB=AD,对角线BD平分∠ABC,∠BAC=∠ADC
①求证:△ABC是比例三角形
②若AB∥DC,如图2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78c44f837a63101c19745cc1a79a740.png)
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352610132402176/2354070668525568/STEM/ac0aba81780b456b9638457696201dec.png?resizew=402)
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解答题-问答题
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【推荐2】汽车盲区是指驾驶员位于正常驾驶座位置时(如图1),其视线被车体遮挡而不能直接观察到的那部分区域.预防进入汽车盲区,能有效预防交通事故发生,提高学生避险能力.小明在学习了交通安全知识后,对汽车盲区产生了兴趣.如图
,是他研究的一个汽车盲区的示意图,
为驾驶员的盲区,驾驶员的眼睛点
处与地面
的距离为
,车宽
,车头
近似看成一个矩形,且满足
,求汽车盲区
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21002725043bdace95b3244d4c75dd74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd3fc1b346d9509ccb1b7792071dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfefc56d7df821dac57be3d046401f68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc451074006e93a4c5f47c5067e92fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ec54e058add3834f16925b022592ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21002725043bdace95b3244d4c75dd74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/67e99687-e87f-4f33-bded-c8ef4cac5d9a.png?resizew=475)
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