too easy. a*a+b*b+c*c if and only if a=b=c>0, no matter a b c are the sides of a triangle or not.

bigsquirrel (小松鼠)
2002-1-20 -05:00

回到话题: a math question thanks!! Suppose triangle ABC has side lengths a, b, c, Prove that if a*a+b*b+c*c=ab+bc+ac, then triangle ABC is an equilateral triangle.

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