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