如图,已知
是
的直径,
与
相切于C,过点B作
,交
延长线于点E.
(1)求证:
是
的平分线;
(2)若
,
的半径
,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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c38bbe49284a2ceab26001ced8cfd56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/4f42ba23-88a8-4a72-8689-f3a51aa81234.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead1eda1ca5b67586379a09a4c3540b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434845564fd5765244f8d1aa9240fa39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
更新时间:2023-10-27 21:32:52
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
,
是
的角平分线,
于点E,
于点F,连接
交
于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/144a9a26-dc95-4049-bce8-31c1a95a0b1a.png?resizew=177)
(1)求证:
垂直平分
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/144a9a26-dc95-4049-bce8-31c1a95a0b1a.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cfe00768a1c9dcd96d5123ed6b4403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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适中
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【推荐2】如图,
为
的角平分线,且
,
,
,垂足分别为
、
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.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/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/28c1a47c-1bca-4718-a02b-0315c7489b5f.png?resizew=105)
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名校
【推荐3】教材呈现:如图是华师版八年级上册数学教材第96页的部分内容.
![](https://img.xkw.com/dksih/QBM/2021/10/21/2833980830392320/2836195168706560/STEM/0d6fe4c9de8c40ca981cd9aa1f34cabd.png?resizew=439)
(1)感知:根据教材内容,如图1,在△ABC中,AD平分∠BAC交BC于D,DE⊥AB于E,DF⊥AC于F.易证DE=DF,AE=AF.(不必证明)
(2)探究;如图2,在(1)的情况下,如果∠MDN=∠EDF,∠MDN的两边分别与AB、AC相交于M、N两点,其它条件不变,请探究AM、AN、AF三条线段的等量关系,并加以证明.
(3)拓展应用:如图3,在Rt△ABC中,∠C=90°,∠BAC=60°,AC=6,AD平分∠BAC交BC于D,∠MDN=120°,ND∥AB,直接写出四边形AMDN的周长= .
![](https://img.xkw.com/dksih/QBM/2021/10/21/2833980830392320/2836195168706560/STEM/0d6fe4c9de8c40ca981cd9aa1f34cabd.png?resizew=439)
(1)感知:根据教材内容,如图1,在△ABC中,AD平分∠BAC交BC于D,DE⊥AB于E,DF⊥AC于F.易证DE=DF,AE=AF.(不必证明)
(2)探究;如图2,在(1)的情况下,如果∠MDN=∠EDF,∠MDN的两边分别与AB、AC相交于M、N两点,其它条件不变,请探究AM、AN、AF三条线段的等量关系,并加以证明.
(3)拓展应用:如图3,在Rt△ABC中,∠C=90°,∠BAC=60°,AC=6,AD平分∠BAC交BC于D,∠MDN=120°,ND∥AB,直接写出四边形AMDN的周长= .
![](https://img.xkw.com/dksih/QBM/2021/10/21/2833980830392320/2836195168706560/STEM/5a5252bdceca4234bac7663adcecbebf.png?resizew=554)
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【推荐1】如图是公园内一个滑梯的示意图,左边是楼梯,中间是过道,右边是滑道,已知滑道
与
的长度一样,滑梯的高度
,
,求出滑梯
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e0f7e08e014294c38b972cc1a8944e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42aec5bacfd620d45eb0a0a76dd58cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/0ce1700c-fbe9-4886-9dca-46b3daa361a2.png?resizew=184)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,
,以
为直径的
与
边交于点D.
边上一点,添一个条件,使直线
是
的一条切线,并证明;
(2)在(1)的条件下,若
,求
的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dedf6894c9ecfebfa4849c957054e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,
是
的直径,延长
到点P,使
.C是
上一点,
,交
于点D,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/a515c211-735e-45a5-9b56-bba20f1288a3.png?resizew=206)
(1)当
是
的切线时,求证:
;
(2)设
,
,求
的值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc1fc39fa72c334a321129d893899a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d5ff57f147aa0628fdd47899b5a132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/a515c211-735e-45a5-9b56-bba20f1288a3.png?resizew=206)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829081f5eb21ee7077b6c7215878da2d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148e063b8ccc49f6745b32b418eb9659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d4c78faa1fef50d8e8ef34b7a774d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec56289a089e9ac95431ec7708137933.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,
是半圆
的直径,
是
的切线,切点为
,
交
于点
,点
是
的中点,连接
,
.
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214841401499648/3215585681203200/STEM/c66f7496dd1b478eabde3a3de6902d3b.png?resizew=119)
(1)求
的度数;
(2)若
,
,求图中阴影部分的面积
(结果精确到
,参考数据:
,
,
取
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214841401499648/3215585681203200/STEM/c66f7496dd1b478eabde3a3de6902d3b.png?resizew=119)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c6ed61381807672914fa66f4648d0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fda9ea183d8935fea806375591f866c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c66e270e12b490ea413a53db09302e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25dbe7f6d0d0aa1ee48a30f4916b597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94eecd59161d1a8dadbbef5184a628d3.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,AB为⊙O的直径,C为⊙O上一点,连接AC,BC,D为AB延长线上一点,连接CD,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/bedc089f-d4cf-4608-836c-0b8db46f4a98.png?resizew=229)
(1)求证:CD是⊙O的切线;
(2)若⊙O的半径为
,
的面积为
,求CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbbf470efc0ca30e0f5bbc5cb5bad1c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/bedc089f-d4cf-4608-836c-0b8db46f4a98.png?resizew=229)
(1)求证:CD是⊙O的切线;
(2)若⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的直径,弦
,
是
的中点,连接
并延长到点
,使
,连接
交
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2890278751207424/2892205908090880/STEM/38f586f1-b9cb-44a9-bbb5-8226acc64c2d.png?resizew=169)
(1)求证:直线
是
的切线;
(2)若
长为
,求
的半径及
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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbc115577cd400ad9b83b0102440c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2890278751207424/2892205908090880/STEM/38f586f1-b9cb-44a9-bbb5-8226acc64c2d.png?resizew=169)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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