Classifying Angles

Vocabulary Acute Angle – an angle that is less than 90 o Obtuse Angle - an angle that measures between 90 o and 180 o Right Angle - an angle that is 90 o Straight Angle - an angle that is180 o

Vocabulary Reflex Angle – an angle that measures between 180 o and 360 o Complementary angles - two angles whose sum is 90 o Supplementary angles - two angles whose sum is 180 o 50 o 40 o 105 o 75 o

Class Example 41 o A B C 1. What is a complementary angle to < ABC? 2. What is a supplementary angle to < ABC?