//13
#include <iostream>
#include <string>
#include <math.h>
using namespace std;
int main()
{
float R1,R2,S1,S2,S3,P;
P=3.14;
cout<<"Enter R1: ";
cin >>R1;
cout<<"Enter R2: ";
cin >>R2;
S1=P*R1*R1;
S2=P*R2*R2;
S3=S1-S2;
cout<<"S1="<<S1;
cout<<"\nS2="<<S2;
cout<<"\nS3="<<S3;
}
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