Write a function to evaluate all the three angels of triangle ABC and PQR in degrees given its sides.

   1:  #include<stdio.h>

   2:  #include<conio.h>

   3:  #include<stdlib.h>

   4:  #include<math.h>

   5:  #define PIE 3.14

   6:   

   7:  void angles(float x,float y,float z, float *a1,float *a2,float *a3);

   8:  void main()

   9:  {

  10:  float a,b,c,A,B,C;

  11:  float p,q,r,P,Q,R;

  12:  printf("Enter the sides of ABC:\n");

  13:  scanf("%f%f%f",&a,&b,&c);

  14:  printf("Enter the sides of PQR:\n");

  15:  scanf("%f%f%f",&p,&q,&r);

  16:  angles(a,b,c,&A,&B,&C);

  17:  angles(p,q,r,&P,&Q,&R);

  18:  printf("Angle A= %.2f\n",A);

  19:  printf("Angle B= %.2f\n",B);

  20:  printf("Angle C= %.2f\n",C);

  21:  printf("Angle P= %.2f\n",P);

  22:  printf("Angle Q= %.2f\n",Q);

  23:  printf("Angle R= %.2f\n",R);

  24:  getch();

  25:  }

  26:  void angles(float x,float y,float z, float *a1,float *a2,float *a3)

  27:  {

  28:  *a1=(180.0/PIE)*acos((y*y+z*z-x*x)/(2.0*y*z));

  29:  *a2=(180.0/PIE)*acos((x*x+z*z-y*y)/(2.0*z*x));

  30:  *a3=(180.0/PIE)*acos((y*y+x*x-z*z)/(2.0*y*x));

  31:  }