Measure

1
Measure Classify Angles

• TEKS 6.6B
• Lesson 2 (4th 6 Weeks)

2
Measuring Angles using a pictorial representation
of a protractor

• Step 1 The vertex of the angle to be measured
  will be located at the center of the base of the
  protractor. Choosing to read either the inner or
  outer scale of the protractor, identify the
  measure where the left ray of the angle crosses
  the scale.

3

• Step 2 Identify the measure where the right ray
  crosses the scale. (Use the same scale as step
  one!)
• Step 3 Find the difference between the two
  measures (subtract).
• This is the measure of the angle!
• Step 4 Make sure you angle measurement is
  reasonable!!!!!!!

4

• Step 5 Write the measure of the angle as
• m B 55
• which is read the measure of angle B is 55
  degrees

5
Types of Angles

• Right angle 90
• Acute angle gt 0, but lt 90
• Obtuse angle gt 90, but lt 180
• Straight angle 180

6
106
58
42
AEB
58 42
16
BEC
106 58
48
7
106
58
135
42
CED
135 106
29
AEC
106 42
64
8
106
58
135
42
AED
135 42
93
BED
135 58
77