What is the angle sum of a triangle?

The angle sum of any triangle is always 180 degrees. This fundamental property is a result of the geometric principles that govern triangles. When you add the measures of the three interior angles of a triangle, they will always equal 180 degrees, regardless of the type of triangle (scalene, isosceles, or equilateral).

For instance, in a simple visual demonstration, if you take a triangle and extend one of its sides, the angles formed on the outside alongside the angles of the triangle will also sum to 180 degrees, reinforcing this fact. This makes the angle sum of a triangle a foundational concept in geometry, essential for understanding more complex geometric relationships and theorems.