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