Calculating circumstance and area of a circle

#include<stdio.h>

#define pi 3.14

void main()

{

float radius,area,circumstance;

clrscr();

printf("Enter radius of the circle : ");

scanf("%f",&radius);

area=pi*radius*radius;

circumstance=2*pi*radius;

printf("\nArea of the circle = %f",area);

printf("\nCircumstance of the circle = %f",circumstance);

getch();

}