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圖中的13題
小弟不太懂做
麻煩師兄教一教小弟!
thz
f.5 circles
2011-09-22 5:16 am
回答 (1)
2011-09-22 5:47 am
✔ 最佳答案
Let x be the circumference of the circle and O be the centre ,then ㄥOBC = 36 * 2 = 72° (∠at centre twice ∠ at ☉ce)So (72/360) x = 6x = 30
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110921000051KK00851