Answer:Two angles that add up to 90 degrees are called complementary angles.
Answer:1. What do you call two angles that add up to 90 degrees? - a) Complementary Angles Complementary angles are two angles that, when added together, result in a right angle (90 degrees). 2. Which of the following pairs of angles are supplementary? - a) Angles that add up to 180 degrees Supplementary angles are two angles that, when added together, result in a straight angle (180 degrees). 3. What type of angles are formed when two lines are crossed by another line? - b) Vertically Opposite Angles When two lines intersect, they form four angles. The angles that are opposite each other (across the intersection point) are called vertically opposite angles. These angles are always equal in measure.Step-by-step explanation:pa brainliest nalang po ty