//Constants
#define _CRT_SECURE_NO_WARNINGS

#define PI 3.142   //define PI as a constant
#include <stdio.h>
#include <math.h>

void main()
{
	float radius, area;

	printf("Please enter radius of choice: ");
	scanf("%f", &radius);
	
	area = PI * pow(radius, 2);

	printf("The area is %.2f", area);

}