Before writing the C program to check whether the triangle is isosceles, we should know the properties of equilateral triangles. In geometry, an isosceles triangle is a triangle that has two sides of equal length.
#include <stdio.h>
int main()
{
int side1, side2, side3;
//Get sides of a triangle from the user
printf("Enter sides of triangle\n");
scanf("%d%d%d", &side1,&side2,&side3);
if((side1==side2) || (side1==side3) || (side2==side3))
{
//two sides are equal, so isosceles triangle
printf("isosceles triangle.\n\n");
}
else
{
printf("Not a isosceles triangle.\n\n");
}
return 0;
}
Output:
