問題詳情
15.如右圖，圓O 是直角△ABC 的內切圓，∠C＝90°， 
＝5，則斜線面積為多少平方單位？
(A) 4π
(B) 30─4π
(C) 60-4π
(D) 4π15 。 
參考答案
無參考答案
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