• 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
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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.
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• 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