[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]

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

Bond007

B， no doubt