Progam that gives the length of side of a triangle

Write a program that gives the length of side of a triangle

//Progam that gives all details of a Triangle given the lengths of its sides

#include <stdio.h>

#include <conio.h>

#include <math.h>

main()

{

            clrscr();

            float a,b,c,S,D,A,B,C,Area,R;

            printf("Enter the lengths of the three sides of the triangle :");

            scanf("%f%f%f",&a,&b,&c);

            S = (a+b+c)/2.0; // S is the semiperimeter of the triangle

            D = S*(S-a)*(S-b)*(S-c);//D is the square of the area of the triangle

            if(D<=0)

            {

                        printf("The triangle cannot be formed");

                        getch();

                        exit(0);

            }

            if((a==b || b==c || c==a) && !(a==b && b==c && c==a))

            // this complex logic is to eliminate interpretting a triangle with all three

            // sides equal as both isosceles and equilateral.

            printf("The triangle is ISOSCELES");

            if(a==b && b==c && c==a)

                        printf("The triangle is EQUILATERAL Type");

            if(a!=b && b!=c && c!=a)

                        printf("The triangle is SCALENE");

           

            Area = sqrt(D);

            R = (a*b*c)/(4.0*Area);

            printf("PERIMETER = %.2f units",(2.0*S));

            printf("AREA = %.2f sq.units",Area);

            printf("CIRCUM RADIUS = %.2f units",R);

            // using sine rule,we get...

            A = (180.0/3.1415926)*asin(a/(2.0*R));// value of pi should be upto 7

            B = (180.0/3.1415926)*asin(b/(2.0*R));// decimal places of accuracy and also

            C = (180.0/3.1415926)*asin(c/(2.0*R));// note that the 7th decimal place

            // 6 and not 7 as it had to be if were

            if(A==90.0 || B==90.0 || C==90.0)

                        // approximated to 7 decimalplaces

                        printf("The triangle is RIGHT ANGLED");

            if(A<90.0 && B<90.0 && C<90.0)

                        printf("The triangle is ACUTE ANGLED");

            if(A>90.0 || B>90.0 || C>90.0)

                        printf("The triangle is OBTUSE ANGLED");

            printf("The angles are as follows :");

            printf("A = %.2f degrees",A);

            printf("B = %.2f degrees",B);

            printf("C = %.2f degrees",C);

            printf("Where A,B,C stand for angles opposite to sides%.2f,%.2f,%.2f",a,b,c);

            printf(" respectively");

            getch();

            return 0;

}