Question

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

Answer 1

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.

Answer 2

Answer:

Complementary

Step-by-step explanation:

If the exterior sides of two adjacent angles are perpendicular, then the angles are complementary angles.

The statement is defining two adjacent triangles that are on a right angles, that is, a angle equal to 90°. We can deduct this because they problem states that their exterior sides are perpendicular, these sides are forming a right angle, because that's what perpendicularity means.

Therefore, the right term that completes the statement is "complementary", because complementary angles are define as adjacent angles which sum is 90°.