如图,扇形OAB的半径OA=4,圆心角∠AOB=90°,点C是弧AB上异于A、B的一点,过点C作CD⊥OA于点D,作CE⊥OB于点E,连结DE,过点C作弧AB所在圆的切线CG交OA的延长线于点G.
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479289567346688/2480063642132480/STEM/604d2eddd8d0414891999d99cdb1e946.png?resizew=112)
(1)求证:∠CGO=∠CDE;
(2)若∠CGD=60°,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479289567346688/2480063642132480/STEM/604d2eddd8d0414891999d99cdb1e946.png?resizew=112)
(1)求证:∠CGO=∠CDE;
(2)若∠CGD=60°,求图中阴影部分的面积.
更新时间:2020-06-08 08:45:18
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【推荐2】如图,在四边形ABCD中,AD∥BC,∠ABC=∠ADC=90°,对角线AC,BD交于点O,DE平分∠ADC交BC于点E,连接OE.
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【推荐1】如图,二次函数
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