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公式你懂得

Posted by NY_xm11 at 2013-04-23 21:35:16 on Problem 2242
已知三角形的三边abc求出半径
R=abc/sqrt(a+b+c)(a+b-c)(a+c-b)(b+c-a)-》周长=圆周率*2*R;就可以的出来了

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