What is the sum of the angles in a triangle?

The sum of the angles in a triangle is always 180 degrees regardless of the type of triangle, whether it be scalene, isosceles, or equilateral. This fundamental property arises from the fact that the angles of a triangle are interior angles, and it can be visually or geometrically demonstrated by drawing lines parallel to one side of the triangle through the opposite vertex. The corresponding angles formed will illustrate that the measures add up to 180 degrees. This concept is crucial in geometry and serves as a foundation for more complex geometric principles and theorems.