Program Luas Dan Keliling Lingkaran (C++)

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    float r, L, K, Pi;
    Pi=3.14;
   
    cout<<"====================================================="<<endl;
    cout<<"         Program Luas Dan Keliling Lingkaran         "<<endl;
    cout<<"====================================================="<<endl;

    cout<<"Masukan jari-jari(r)    : "; cin>>r;
    L=Pi*r*r;
    K=2*Pi*r;
    cout<<"Luas lingkaran         : "<<L<<endl;
    cout<<"Keliling lingkaran     : "<<K<<endl;
    system("pause");
    return 0;
}

Hasil/ Outputnya =

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