Contents Recap the terms Test Yourself - 1 Angles in daily life Congruent angles Pairs of angles: Types What is an angle? Test Yourself - 2 Naming an angle Pairs of angles formed by a transversal Interior and exterior of an angle Test Yourself - 3 Measurement of angle Types of angle: Right angle Obtuse angle Acute angle Straight angle

ANGLES

Right angle: An angle whose measure is 90 degrees. Obtuse Angle Acute Angle Straight Angle

Examples Of Right Angle

Obtuse angle: An angle whose measure is greater than 90 degrees. Right Angle Obtuse Angle Acute Angle Straight Angle

Examples Of Obtuse Angle

Acute angle: An angle whose measure is less than 90 degrees. Right Angle Obtuse Angle Acute Angle Straight Angle

Examples Of Acute Angle

Straight angle: An angle whose measure is 180 degrees. Right Angle Obtuse Angle Acute Angle Straight Angle

Examples Of Straight Angle

Complementary Angles Two angles whose sum is 90 degrees. 40 50 30 60

Find Missing Angle Measures Angles M and N are complementary. If m<m = 45 what is the measure of <n? m<M + m<N = 90 45 + m<N = 90 - 45 = -45 m<N = 45

Supplementary Angles Two angles whose sum is 180 degrees. 120 60

Find Missing Angle Measures Angles M and N are supplementary. If m<m = 85 what is the measure of <n? m<M + m<N = 180 85 + m<N = 180 - 85 = -85 m<N = 95

Let’s Try Some Examples 35 55 110 60 140 30 10 90 20 150 70 162 18

Answers C N S

Find the missing complementary angle Angle 1 = 60 degrees Angle 2 = ________ Angle 1 = 24 degrees Angle 1 = 48 degrees Angle 1 = 16 degrees

Find the missing supplementary angle Angle 1 = 160 degrees Angle 2 = ________ Angle 1 = 63 degrees Angle 1 = 148 degrees Angle 1 = 14 degrees