This document defines and describes the four types of triangles: equilateral triangles have three equal sides and three equal interior angles; isosceles triangles have two equal sides and two equal interior angles; scalene triangles have no equal sides and all different interior angles; right-angled triangles contain one 90 degree interior angle and can be either isosceles or scalene.

1. Types
of Triangles

2. Equilateral Triangle
All 3 Sides are equal in Length
All 3 interior angles are the same

3. Isosceles Triangle
Two Sides of equal Length
Two interior angles are the same

4. Scalene Triangle
No Sides of equal Length
All interior angles are different

5. Right-Angled Triangles
They have an Interior angle of 90 degrees
Right-Angled Triangles can be either Isosceles or scalene
triangles
Scalene Right Angled Triangle Isosceles Right Angled Triangle

6. Right-Angled Triangles
They have an Interior angle of 90 degrees
Right-Angled Triangles can be either Isosceles or scalene
triangles
Scalene Right Angled Triangle Isosceles Right Angled Triangle