#include <iostream> using namespace std; int main() { double r1,r2,r3,r4,r5; double s1,s2,s3,s4,s5; cin>>r1; cout<<"s1="<<3.1415926*r1*r1<<endl; cin>>r2; cout<<"s2="<<3.1415926*r2*r2<<endl; cin>>r3; cout<<"s3="<<3.1415926*r3*r3<<endl; cin>>r4; cout<<"s4="<<3.1415926*r4*r4<<endl; cin>>r5; cout<<"s5="<<3.1415926*r5*r5<<endl; return 0; }