如图,在△ABC中,∠ABC=90°,AB=BC=2,以点C为圆心,线段CA的长为半径作弧AD,交CB的延长线于点D,求出阴影部分的面积(结果保留π).
![](https://img.xkw.com/dksih/QBM/2022/8/19/3047973256749056/3068980584742912/STEM/2b2c01adc70c4a848c208aac60ee3d9f.png?resizew=160)
21-22九年级上·吉林·期末 查看更多[2]
更新时间:2022-09-18 09:59:53
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【推荐1】如图,△ACB与△CED都是等腰直角三角形,∠BCA=∠DCE=90°,且点D在线段AB上,连接AE.
![](https://img.xkw.com/dksih/QBM/2023/11/23/3374244893327360/3374434516598784/STEM/4b4edce71a6e46ffb5572cba830abdef.png?resizew=103)
(1)求证:△BCD≌△ACE;
(2)判断△DAE的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2023/11/23/3374244893327360/3374434516598784/STEM/4b4edce71a6e46ffb5572cba830abdef.png?resizew=103)
(1)求证:△BCD≌△ACE;
(2)判断△DAE的形状,并说明理由.
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【推荐2】如图,△ABC是等边三角形,将△ABC沿直线BC向右平移,使点B与点C重合得到△DCE,连接BD交AC于点F.猜想AC与BD的位置关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/899c5e49-d86e-4ba8-888d-3ad9c7ac4365.png?resizew=199)
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【推荐2】如图,在平行四边形
中,F是
的中点,延长
到点E.使
,连接
、
.
;
(2)若
,
,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
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【推荐1】已知AB是⊙O的直径,点C是圆O上一点,点P为⊙O外一点,且OP∥BC,∠P=∠BAC.
(1)求证:PA为⊙O的切线;
(2)如果OP=AB=6,求图中阴影部分面积.
(1)求证:PA为⊙O的切线;
(2)如果OP=AB=6,求图中阴影部分面积.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889099099930624/2892003989037056/STEM/0b7e4db3-f1fa-4aaa-bedb-de34f2121d7f.png?resizew=183)
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【推荐2】如图,在
中,
,
的角平分线
交
边于
,以
上一点O为圆心,
为半径作
,分别交
、
于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/913d4276-5cec-4843-9306-1883ff73fa03.png?resizew=164)
(1)判断直线
与
的位置关系,并说明理由;
(2)若
的半径为4,
.
①求线段
与
的长度,并比较大小;
②直接写出线段
、
与
围成的阴影部分的图形面积______.(结果保留根号和
)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/913d4276-5cec-4843-9306-1883ff73fa03.png?resizew=164)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
①求线段
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②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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