The sum of the measures of the interior angles of a triangle is always 180 degrees.

This is a fundamental property of triangles in Euclidean geometry, and it holds true regardless of the type of triangle (whether it's equilateral, isosceles, or scalene).

Want more details or have any questions? Here are some related topics you might find interesting:

1. What is the sum of the interior angles of a quadrilateral?
2. How can the sum of interior angles be calculated for any polygon?
3. What is the difference between interior and exterior angles of a polygon?
4. How do the interior angles of a triangle relate to the type of triangle?
5. What happens to the sum of angles in non-Euclidean geometry?

Tip: A quick way to remember the sum of a triangle’s angles is to think about dividing a polygon into triangles! Each triangle contributes 180°, and a polygon’s total angle sum is the number of triangles (formed by diagonals) multiplied by 180°.