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