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按照四分之一圓面積計算兩個扇形面積,差值就是.600-200=400是內圓半徑,600是外圓半徑.
你說的是梯形面積公式吧? (上底加下底)乘高除以2
是圓的半徑公式嗎? 如果是的話,請看 r=d/2 r=c/2π 如果是其他的話,抱歉,我也不知道.
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