一小圆在大圆内,两圆面积差为阴影.大圆直径为a,两圆直径差为d,求阴影面积.当a=5,d=2时,求阴影.最终结果为12.56,是两小题:(1)阴影面积(结果为πd/4(2a-d))(2)a=5,d=2时的阴影面积(12.5
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![一小圆在大圆内,两圆面积差为阴影.大圆直径为a,两圆直径差为d,求阴影面积.当a=5,d=2时,求阴影.最终结果为12.56,是两小题:(1)阴影面积(结果为πd/4(2a-d))(2)a=5,d=2时的阴影面积(12.5](/uploads/image/z/2120369-41-9.jpg?t=%E4%B8%80%E5%B0%8F%E5%9C%86%E5%9C%A8%E5%A4%A7%E5%9C%86%E5%86%85%2C%E4%B8%A4%E5%9C%86%E9%9D%A2%E7%A7%AF%E5%B7%AE%E4%B8%BA%E9%98%B4%E5%BD%B1.%E5%A4%A7%E5%9C%86%E7%9B%B4%E5%BE%84%E4%B8%BAa%2C%E4%B8%A4%E5%9C%86%E7%9B%B4%E5%BE%84%E5%B7%AE%E4%B8%BAd%2C%E6%B1%82%E9%98%B4%E5%BD%B1%E9%9D%A2%E7%A7%AF.%E5%BD%93a%3D5%2Cd%3D2%E6%97%B6%2C%E6%B1%82%E9%98%B4%E5%BD%B1.%E6%9C%80%E7%BB%88%E7%BB%93%E6%9E%9C%E4%B8%BA12.56%2C%E6%98%AF%E4%B8%A4%E5%B0%8F%E9%A2%98%EF%BC%9A%EF%BC%881%EF%BC%89%E9%98%B4%E5%BD%B1%E9%9D%A2%E7%A7%AF%EF%BC%88%E7%BB%93%E6%9E%9C%E4%B8%BA%CF%80d%2F4%EF%BC%882a-d%EF%BC%89%EF%BC%89%EF%BC%882%EF%BC%89a%3D5%EF%BC%8Cd%3D2%E6%97%B6%E7%9A%84%E9%98%B4%E5%BD%B1%E9%9D%A2%E7%A7%AF%EF%BC%8812.5)
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