/* June 2, 1998 */
/* Program to determine the length of one side of a triangle given 
values for b, c, and alpha */

#include <stdio.h>
#include <math.h>

#define PI 3.14159  /* Define PI */

main ()
{
	/* declaration */
	double a, b, c, alpha;

	/* Enter values */
	printf("Enter value of b> ");
	scanf("%lf", &b);
	printf("Enter value of c> ");
        scanf("%lf", &c);
	printf("Enter value of alpha> ");
        scanf("%lf", &alpha);

	/* Calculation */
	a =sqrt(pow(b,2)+ pow(c,2) - 2 * b * c * cos(alpha * PI /180.0));

	/* Display values */
	printf("The value of a is %.2f \n", a);
}