#include<iostream> using namespace std; int main() { double r1=1,r2=3,r3=5,r4=7,r5=9,p=3.1415926; cout<<r1*r1*p<<endl<<r2*r2*p<<endl<<r3*r3*p<<endl<<r4*r4*p<<endl<<r5*r5*p; return 0; }