Answer:
Step-by-step explanation:
2. Perpendicular lines form right angles.
3. A right angle has a measure of 90 degrees.
4. Angle addition postulate
5. Angles that add to form a right angle have a measure of 90 degrees.
7. Congruent angles have equal measure.
8. Substitution
9. Angles with measures that add to 90 deg are complementary.
