If the exterior sides of two adjacent angles are perpendicular, then the angles are _____ angles. complementary right vertical supplementary

Adjacent angles are when the 2 angles have a common vertex and a common arm. 
if the exterior sides of 2 adjacent angles are perpendicular, then the angles are complementary angles. 
Then the sum of the 2 adjacent angles is a right angle - 90°.
When 2 angles add up to 90°, they are called a pair of complementary angles.