4πr^2=4000
中間部驟
maths
2007-03-04 7:59 am
回答 (1)
2007-03-04 8:32 am
✔ 最佳答案
4πr^2=4000r^2 = 4000/4π
r = sq. rt. (1000/π)
r = 17.8, correct to 3 sig. fig.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070303000051KK05887