問題詳情
5. ( )已知圓O的直徑為16公分， 
為圓O上的一弧，其所對的圓心角為135°，則扇形AOB的面積＝？
(A) 20π
(B)24π
(C) 72π
(D) 96π
參考答案
無參考答案
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