周长为10的圆和正方形哪个面积大

332399319

#include <iostream>
using namespace std;
float r,c,a,sy,sz;
int main()
{
c=10;
r=c/3.14/2;
sy=3.14*r*r;
a=c/4;
sz=a*a;
if(sy>sz) cout<<"yuan";
else cout<<"zheng";
return 0;
}