题型:解答题-证明题
难度:0.65
引用次数:289
题号:10343742
已知:如图,在
中,
为
延长线上一点,连接
交
的外接圆于点
,连接
.
(1)求证:
平分
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d5d0248648568aa5d182ade3fc4b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](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/9fb7c9b5376c6d491e743b710bc25701.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df86d27c8c90570e80e8e7f865cf82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/928a73ef-1b44-41fc-991a-84eb649fe9a6.png?resizew=126)
更新时间:2020-05-05 11:00:13
|
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解答题-问答题
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适中
(0.65)
【推荐1】小明和小丽想用所学知识测量一棵树的高度
,如图,小丽先站在点E处观测树的顶端A,视线
与水平线的夹角为
;然后,小丽继续站在E处,小明在小丽与树之间的线段
上放一平面镜,经过不断调整,当平面镜放置在C处时,小丽刚好能在镜子中看到树的顶部A的像,这时测得
.已知小丽同学的眼睛到地面的距离
,点B、C、E在一条直线上,
,
,求这棵树的高度
.(平面镜大小忽略不计)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2198a91b51d352664d9c8f53488a5c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba1ac2ccd8bc20780d74e32d8d2b4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4dc4d7d30af1cdce660795e0fd7d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3884d6b8273958f9caf3ecd927fdd50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/feed409c-8235-45e4-af27-fa2a1a8d55de.png?resizew=141)
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解答题-证明题
|
适中
(0.65)
【推荐2】在
中,
,点E在AB上,点D在BC上,
,AD与CE相交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/e1d12916-b225-4a76-b06d-8a2048fca8f9.png?resizew=301)
(1)如图1,求证:
;
(2)如图2,当
时,在不添加任何辅助线的条件下,直接写出图2中所有的等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/e1d12916-b225-4a76-b06d-8a2048fca8f9.png?resizew=301)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1150e7caf86393601b45976f94f3e5.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,弦
与
成
角,
交
的延长线于点B.且
.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968741049409536/2974931566059520/STEM/e63ad1e6-633b-4a5c-a859-73b0b9514a6c.png?resizew=228)
(1)求证:
为
的切线;
(2)若
,求
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48119b3932497634478f656c752ec4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968741049409536/2974931566059520/STEM/e63ad1e6-633b-4a5c-a859-73b0b9514a6c.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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名校
【推荐2】如图,AB为⊙O的直径,弦CD⊥AB于E,∠CDB=15°,OE=2
.
(1)求⊙O的半径;
(2)将△OBD绕O点旋转,使弦BD的一个端点与弦AC的一个端点重合,则弦BD与弦AC的夹角为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求⊙O的半径;
(2)将△OBD绕O点旋转,使弦BD的一个端点与弦AC的一个端点重合,则弦BD与弦AC的夹角为 .
![](https://img.xkw.com/dksih/QBM/2018/1/17/1862141816037376/1862475456315392/STEM/124197da-534d-4b49-ac19-00f29c7433eb.png)
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名校
【推荐1】如图,四边形ABCD内接于⊙O,D是弧AC的中点,延长BC到点E,使
,连接BD,ED.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2991846610518016/2994815655133184/STEM/4b6acc2d-70db-4bc0-81ae-ec8279c57574.png?resizew=206)
(1)求证:
;
(2)若
,
,⊙O的直径长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b59f0e6f7fa9c50e7f5cc146ba1af1.png)
![](https://img.xkw.com/dksih/QBM/2022/6/1/2991846610518016/2994815655133184/STEM/4b6acc2d-70db-4bc0-81ae-ec8279c57574.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dca4fa129b5352b0bf5542965098ea0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
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【推荐2】根据所学知识完成下列问题:
(1)如图1,
是
的直径,C、D是
上的两点,若
,
,求:①
的度数;②
的度数.
(2)如图2,
的弦
垂直平分半径
,若
的半径为4,求弦
的长.
(1)如图1,
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a631226b2177fd5ef032b5767c9b3b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/ac8720b2-5df1-4533-8ca8-33763bd9dc7e.jpg?resizew=281)
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解答题-证明题
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【推荐1】如图,在
中,
,以
上的一点
为圆心,
为半径作
,与
切于点
,交
于点
,交
于点
.
(1)求证:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/9a5cf3e2-dfdf-4fbb-903d-99cca8c6e61b.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b48370e7991eb63cf24496a9fb89e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8beab26db66465c229c73f834b98a5a8.png)
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