Question

A pair of angles whose sum is 90 degrees are called:

Answer 1

Hello!

A pair of angles whose sum is 90° are called Complementary Angles. The answer is Complementary because Complementary Angles are angles that make a sum of 90°. Supplementary Angle are angles whose sum is 180° and Adjacent Angles are angles that have a common side or common vertex.

I hope this helps!

Answer 2

Answer:

B) Complementary angles

Step-by-step explanation:

A pair of angles whose sum is 90 degrees are respectively known as complementary angles; this means that their individual angle measures cannot be more than 90, so they are acute angles.  Perhaps the measure of complementary angles are 45 + 45 = 90.  Regardless, I hope this meets your expectations!