area and round program */
#include
int main()
{
float r, luas, keliling;
printf( "jari-jari = " );
scanf( "%f", &r );
luas = r * r * 3.14;
printf( "luas = %f\n", luas );
keliling = 2 * r * 3.14;
printf( "keliling = %f\n", keliling );
return 0;
}
output=
jari-jari = 100
luas = 31400
keliling = 628
