如图,在△ABC中,AB=AC,E在AC上,经过A,B,E三点的圆O交BC于点D,且D点是
的中点.
(1)求证:AB是圆的直径;
(2)若AB=8,∠C=60°,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
(1)求证:AB是圆的直径;
(2)若AB=8,∠C=60°,求阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883422135181312/2886436156825600/STEM/4851620a-2a64-430c-bb10-4c7a1495ea67.png?resizew=115)
更新时间:2022-01-03 12:12:18
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【推荐1】如图1,四边形OABC中,OA=a,OC=3,BC=2,∠AOC=∠BCO=90°,经过点O的直线l将四边形分成两部分,直线l与OC所成的角设为θ,将四边形OABC的直角∠OCB沿直线l折叠,点C落在点D处(如图1).
(1)若折叠后点D恰为AB的中点(如图2),求θ的度数;
(2)若θ=45°,四边形OABC的直角∠OCB沿直线l折叠后,
①点B落在点四边形OABC的边AB上的E处(如图3),求a的值;
②若点E落在四边形OABC的外部,直接写出a的取值范围.
(1)若折叠后点D恰为AB的中点(如图2),求θ的度数;
(2)若θ=45°,四边形OABC的直角∠OCB沿直线l折叠后,
①点B落在点四边形OABC的边AB上的E处(如图3),求a的值;
②若点E落在四边形OABC的外部,直接写出a的取值范围.
![](https://img.xkw.com/dksih/QBM/2014/12/17/1573772124577792/1573772130516992/STEM/35359fc135bb4b49a268d5ac83027e15.png)
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【推荐2】如图,在锐角
中,点E是
边上一点,
,
于点D,
与
交于点G.
![](https://img.xkw.com/dksih/QBM/2022/10/29/3098231082606592/3099632006782976/STEM/c1e141ce5d6c49288e46d62174706799.png?resizew=214)
(1)求证:
;
(2)求证:
是等腰三角形.
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2022/10/29/3098231082606592/3099632006782976/STEM/c1e141ce5d6c49288e46d62174706799.png?resizew=214)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa21fb75facc42a37f2e97e90aa151bd.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257de6307bba9102afacf04aef55d224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
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【推荐2】如图,AB是⊙O的直径,点C是⊙O上一点,点D是OB的中点,过点D作AB的垂线交AC的延长线于点F,过点C作⊙O的切线交FD于点E.
(1)求证:CE=EF;
(2)如果sin∠F=
,EF=5,求AB的长.
(1)求证:CE=EF;
(2)如果sin∠F=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://img.xkw.com/dksih/QBM/2019/9/14/2290442573643776/2291319142252544/STEM/79d31a1dea2c4fd6bb4dcc2bd2a5212a.png?resizew=121)
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【推荐1】如图,若
是
的外接圆,
为直径,
.
(1)求
的度数;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
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【推荐2】如图,一只羊被4米长的绳子拴在长为3米,宽为2米的长方形水泥台的一个顶点上,水泥台的周围都是草地,求这头羊能吃到草的草地面积是多少?(结果精确到0.01平方米)
![](https://img.xkw.com/dksih/QBM/2020/10/21/2575866965745664/2575978903298049/STEM/baac7975901247d6862ff4006e4c4801.png?resizew=240)
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