Question

Chantelle constructs a triangle with angles measuring 65 degrees and 38 degrees. What must be true of the measure of the third angle in her construction?

Answer 1

77 degrees

Explanation:

The sum of the three interior angles of a triangle is always 180 degrees. If two such angles are known, we add them together and subtract the sum from 180 degrees: 180 - 103 degrees, or 77 degrees. This is the measure of the 3rd angle.