An illustration showing different types of triangles, including equilateral, isosceles, scalene, equiangular, acute, right, and obtuse triangles, with labels and angles.

Diagram of types of triangles: equilateral, isosceles, scalene, equiangular, acute, right, and obtuse triangles, with side and angle characteristics.

Triangle

Category: Geometry Date: November 16, 2024

Definition of Triangle

A triangle in geometry is a polygon with three sides and three angles. The sum of the interior angles of a triangle is always 180 degrees.