#include<stdio.h>
#definePI 3.141
int main()
{
float r, a;
printf("Radius: ");
scanf("%f", &r);
a = PI * r * r;
printf("%f\n", a);
return 0;
}
#definePI 3.141
int main()
{
float r, a;
printf("Radius: ");
scanf("%f", &r);
a = PI * r * r;
printf("%f\n", a);
return 0;
}
OUTPUT:
Radius: 2
12.56
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