C program for find area of circle

Area of Circle

#include < stdio.h >
#include < math.h >
#define PI 3.142

void main()
{
float radius, area;

printf("Enter the radius of a circle \n");
scanf("%f", &radius);

area = PI * pow(radius, 2);

printf("Area of a circle = %5.2f\n", area);
}