20. When do you say that angles are congruent?
A. They have the same rays. C. They have the same measures of angles.
B. They lie on the same plane. D. They are opposite angles.
21. What are formed when two lines intersect perpendicularly?
A. Common vertex B. Vertical angles C. Congruent angles D. All of the above
22. Which is TRUE to vertical angles?
A. Angles are congruent and opposite. C. Angles are congruent but adjacent.
B. Angles are not congruent but opposite. D.Angles are congruent but not adjacent.
23. What is the sum of the measures of complementary angles?
A. 45°
B. 60°
C.90°
D.180°
24. What is the sum of the measures of supplementary angles?
C.90°
D.180°
A. 45°
B. 60°​