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Area of circle

Calculates the area of a circle

#include <stdio.h>

#define PI 3.14159

int main()
{
float sum , radius ;
printf("This program works out the area of a circle.\n");
printf("Enter the radius of the circle.\n");
scanf("%f",&radius);
/*area of a circle is pi * radius * radius*/
sum = PI * radius * radius;
/*display the area*/
printf("The area of a circle is %f.\n",sum);
return 0;
}