recap the terms angles in daily life what is an angle? naming an angle interior and exterior of an...
TRANSCRIPT
• 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 = ________