mathematics M-2

• if the measure is 90 it is complementary angle
• measure is 180 it is supplementary
• its congruent angles if there measures are equal
• its adjacent angles if they have a common vertex
• linear pair when they are both, adjacent and supplementary
• its vertical angles when they are non adjacent and formed by two intersecting lines
• ∠X and ∠Y are complementary angles. If m ∠Y = 23°, then what is the

  measure of ∠X? 23
• ∠R and ∠S are congruent angles. What is the measure of ∠R if ∠S is a

  right angle? 90
• If an angle measure 114°, what is the measure of its supplement? 180
• These pair of angles are both adjacent and supplementary. linear pair
• These angles are formed when two straight lines intersect each other. vertical lines
• complementary angles are congruent. yes
• vertical angles are congruent. no
• pair of supplementary are both obtuse. No
• pair of congruent angles form a linear pair. yes