Pentagonal Area(五边形面积)

1、question: 2、code: #include<iostream> #include<cstdio> #include<cmath> using namespace std; double area(double x,double y,double z) { double s,p,m; p=(x+y+z)/2; m=p*(p-x)*(p-y)*(p-z); s=sqrt(m); retu

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