calculating the area of a sector of a circle

#include <stdio.h>

#include <math.h>

int main(void)

{

/*Declare and initialize variables. */

double d=50, radius=4, sector, pi=3.14159265359;

/*solves for area of a sector*/

sector = pi*radius*radius*(d/360);

/*print Nicole's code*/

printf("The area of the sector of the circle is ""%5.2f \n" "units^2" ,sector);

//exit program

return 0;

}