#include<iostream> using namespace std; int main(){ double a=1,b=3,c=5,d=7,e=9; cout<<a*a*3.1415926<<endl; cout<<b*b*3.1415926<<endl; cout<<c*c*3.1415926<<endl; cout<<d*d*3.1415926<<endl; cout<<e*e*3.1415926<<endl; return 0; }