Question

angles of a triangle
interior angles
exterior angles - formed
when the sides of the
triangle are extended
triangle sum
theorem
the sum of the measures of the interior
angles of a triangle is______

Explanation:

The Triangle Sum Theorem is a fundamental concept in geometry. It states that the sum of the interior angles of a triangle is always \(180^{\circ}\). This theorem can be proven through various methods, such as drawing a parallel line to one side of the triangle and using properties of alternate interior angles.

Answer:

\(180^{\circ}\)