問題詳情
2.如右圖子芹將兩個相同大小的光碟疊合在一起，且
＝9 公分，已知光碟的半徑為 9 公分，則斜線部分的周長為多少公分？
(A) 4π
(B) 6π
(C) 8π
(D) 10π
參考答案
無參考答案
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