[求助] 一条件充分性题

crossmoon

一三角形内接一圆,三角形一边长为6,问此三角形是否为正三角形.
(1) 此三角形两边相等.
(2) 此圆周长为 6 pai
机经答案为E,我觉得是B.由直径是6,推出不可能是正三角形.
对吗?

[此贴子已经被作者于2004-3-18 10:34:29编辑过]

Bond007

B， no doubt

dancingforum

I think it is B too.

Assume it is an equilateral triangle, the length of its
side should be sqrt(27),given the circumference of
the circle as 6pai.

more opinions on this question needed please