Question: Interior Angles

Answer: The angles of a polygon.

Question: Exterior Angles

Answer: Angles that form linear pairs with the interior angles of a polygon.

Question: Corollary to a theorem

Answer: A statement that can be proved easily using the theorem.

Question: Triangle Sum Theorem

Answer: The sum of the measures of the interior angles of a triangle is 180°.

Question: Exterior Angle Theorem

Answer: The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.