Question

Which set of three angles could represent the interior angles of a triangle?
49 degrees, 59 degrees, 72 degrees
34 degrees, 45 degrees, 11 degrees
24 degrees, 51 degrees, 15 degrees
45 degrees, 70 degrees, 85 degrees

Answer 1

49°, 59°, 72° — their sum is 180°, so they can be a triangle's interior angles. The others sum to 90°, 90°, and 200° respectively, so they cannot.