求阴影部分的面积,五下题目如图,直径bc=20米,ab=ac,d为ac的中点,求阴影部分的面积.愈快愈好啊!
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![求阴影部分的面积,五下题目如图,直径bc=20米,ab=ac,d为ac的中点,求阴影部分的面积.愈快愈好啊!](/uploads/image/z/9497542-22-2.jpg?t=%E6%B1%82%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF%2C%E4%BA%94%E4%B8%8B%E9%A2%98%E7%9B%AE%E5%A6%82%E5%9B%BE%2C%E7%9B%B4%E5%BE%84bc%3D20%E7%B1%B3%2Cab%3Dac%2Cd%E4%B8%BAac%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF.%E6%84%88%E5%BF%AB%E6%84%88%E5%A5%BD%E5%95%8A%21)
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