C Program to Classify Triangle as Equilateral, Isosceles or Scalene

Posted on September 30, 2011June 30, 2026 by Sandeepa Nadahalli

A triangle is classified by the relationship between its three sides: Equilateral — all three sides are equal (all angles are 60°) Isosceles — exactly two sides are equal (two base angles are equal) Scalene — all three sides are different (all angles are different) Before classifying, the program validates the triangle inequality: for any …

Area of an Isosceles Triangle in C – Formula, Code, and Example

Posted on September 30, 2011June 29, 2026 by Sandeepa Nadahalli

The area of an isosceles triangle in C is computed using the Pythagorean theorem: given the base and the length of the two equal sides, you drop a perpendicular from the apex to the midpoint of the base, splitting the triangle into two right triangles. The height h = sqrt(side² − (base/2)²), and the area …