Area of the circle

Area of the circle

 

#include<stdio.h>

#include<math.h>

main()

{

    float a,b,x,y,dist,rad,area;

    printf("\nEnter first point a,b = \n");

    scanf("%f %f",&a,&b);

    printf("\n\nEnter another point x,y = \n");

    scanf("%f %f",&x,&y);

    dist = sqrt((a-x)*(a-x)+(b-y)*(b-y));

    rad = dist/2;

    area = 3.1416*rad*rad;

    if(dist>1)

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

    else

        printf("no circle!!! how i can compute the area");

    return 0;

}