The sum of two interior angles is supplementary to the third interior angle.

Question

The sum of two interior angles is supplementary to the third interior angle.

a.) always
b.) sometimes
c.) never

Which one? A, B or C? Please explain as I don’t understand what this means, and how to solve it.
This is semi - urgent.

Answer 1

A. Always. This is a property of triangles known as the Triangle Sum Theorem. This theorem states that the sum of the three interior angles of a triangle is always equal to 180°. Therefore, if two of the angles are added together, the sum of those two angles will be supplementary (equal to 180°) to the third angle.

The sum of two interior angles is supplementary to the third interior angle.

Thanks!