Question

15 the sum of all three interior angles of a triangle is always equal to which of the following? 180 degrees, 45 degrees, 360 degrees, 90 degrees

Explanation:

The fundamental geometric property of a triangle states that the sum of its three interior angles is always 180 degrees. This is a well - known theorem in geometry. 45 degrees is too small, 360 degrees is the sum of interior angles of a quadrilateral, and 90 degrees is just a right angle (not the sum of all three angles of a triangle).

Answer:

180 degrees