• Recap the terms

• Angles in daily life

• What is an angle?

• Naming an angle

• Interior and exterior of an angle

• Measurement of angle

• Types of angle: Right angle

Obtuse angle

Acute angle

Straight angle

• Test Yourself - 1

• Congruent angles

• Pairs of angles: Types

• Test Yourself - 2

• Pairs of angles formed by a transversal

• Test Yourself - 3

ANGLES

Right angle: An angle whose measure is 90 degrees.

Examples Of Right Angle

Obtuse angle: An angle whose measure is greater than 90 degrees.

Examples Of Obtuse Angle

Acute angle: An angle whose measure is less than 90 degrees.

Examples Of Acute Angle

Straight angle: An angle whose measure is 180 degrees.

Examples Of Straight Angle

Complementary Angles

n 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

10

20

150

110

70

70

10

162

18

Answers

C N N

N N N

S N S

Find the missing complementary angleAngle 1 = 60 degrees

Angle 2 = ________

Angle 1 = 24 degrees

Angle 2 = ________

Angle 1 = 48 degrees

Angle 2 = ________

Angle 1 = 16 degrees

Angle 2 = ________

Find the missing supplementary angleAngle 1 = 160 degrees

Angle 2 = ________

Angle 1 = 63 degrees

Angle 2 = ________

Angle 1 = 148 degrees

Angle 2 = ________

Angle 1 = 14 degrees

Angle 2 = ________