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