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Transcript
```Geometry
Level 1
Angle names
Acute angle
Web animation
An acute angle is between 0 and 90 degrees
Angle names
Obtuse angle
Website animation
An obtuse angle is between 90 and 180
degrees
Angle names
Reflex angle
A reflex angle is between 180 and 360
degrees
Angle names
Right angle
A right angle is 90 degrees
Angle names
Right angle
A right angle is 90 degrees
Angle names
Straight angle
A straight line is 180 degrees
Naming angles
• The angle is at B
A
B
ABC
C
Guessing the angle size
• The clock is divided
into 12 hours.
• One complete circle
is 360 degrees.
• Each hour makes 30
degrees.
30

60

90

120

210

270

180

What angle do the hands of
the clock make?
• 4 lots of 30 degrees.
• 120 degrees.
• OR the reflex angle
is 240 degrees.
Guess the angle size
150
210
60
300
OR
90
270


170
190
Complementary angles
• Two angles which
degrees are said to
be complementary.
Complementary angles
• What is the
complement of 58
degrees?
?
Complementary angles
• 32 degrees
58  32  90
Complementary angles
• What is the
complement of 45
degrees?
?
?
Complementary angles
• 45 degrees
45  45  90
Supplementary angles
• Two angles which
degrees are said to
be supplementary.
Supplementary angles
• What is the
supplement of 120
degrees?
?
?
Supplementary angles
• 60 degrees?
?
Supplementary angles
• What is the
supplement of 40
degrees?
?
Supplementary angles
• What is the
supplement of 140
degrees?
Measuring angles
• We use a protractor
to measure angles.
There are two scales marked