#include<iostream> using namespace std; int main() { double a=1; double b=2; double c=3; double d=4; double e=5; const double y=3.1415926; cout<<y*a*a<<endl; cout<<y*b*b<<endl; cout<<y*c*c<<endl; cout<<y*d*d<<endl; cout<<y*e*e<<endl; return 0; }