Sample Response: The sum of the measures of the interior angles of a triangle is 180°. m∠B + 50 + 65 = 180, so m∠B = 65°. The sum of adjacent angles forming a straight line is also 180°. m∠2 + 50 + 65 =180, so m∠2 = 65°. The angles are congruent. Check all that you included in your response.Interior angles add up to 180°, so mB = 65°.Straight lines add up to to 180°, so m2 = 65°.2 and B are congruent.