我吾明點解,要中文解釋

2007-12-16 11:37 pm

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

回答 (1)

2007-12-17 2:39 am

✔ 最佳答案

留意三角形 OAB，
OB=OC=6 (因為是半徑)
NB=AB除2 = 8除2 = 4

ON = (6的平方減4的平方) 再開方 = 開方20 = 2乘開方5

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