我吾明點解,要中文解釋
Consider triangle OAB:
OB=OC=6 (radius)
NB=AB/2 = 8/2 =4
ON = sqrt(6^2-4^2) = sqrt(20) = 2sqrt5
收錄日期: 2021-04-25 16:21:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071216000051KK02338