#include<bits/stdc++.h> using namespace std; int main() { double pi=3.1415926; int a=1,b=3,c=5,d=7,e=9,aa=0,bb=0,cc=0,dd=0,ee=0; double asa=0,bsa=0,csa=0,dsa=0,esa=0; aa=a*a; bb=b*b; cc=c*c; dd=d*d; ee=e*e; asa=aa*pi; bsa=bb*pi; csa=cc*pi; dsa=dd*pi; esa=ee*pi; cout<<asa<<endl; cout<<bsa<<endl; cout<<csa<<endl; cout<<dsa<<endl; cout<<esa<<endl; return 0; }