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分情况，分离相切，内含，相交

Posted by dreamfox at 2009-07-15 03:25:57 on Problem 2546 
给出相交的公式
        A=acos((b*b+c*c-a*a)/(2*b*c));//Ïཻ
        B=acos((a*a+c*c-b*b)/(2*a*c));
        s=(a+b+c)/2;
        s=sqrt(s*(s-a)*(s-b)*(s-c));
        area=a*a*B+b*b*A-2*s;

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