Algoritma :

1.Inisialisasi double phi=3.14,luas,kel
int rad
2. input bilangan dalam rad
3. hitung : luas = phi*rad*rad
Kel = 2*phi*rad
4. cetak hasil luas dan kel

Coding:
/*M.Afrizal 7409030053*/
#include
main()

{

double luas,kel;
int rad;

printf("masukan rad =");
scanf("%d",&rad);

luas=3.14*rad*rad;

kel=2*3.14*rad;

printf("luas dan kel =%g\n",luas);
printf("keliling lingkaran = %g",kel);
}
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