Using a Protractor

1
Using a Protractor
2
Identifying Types of Angles

• An acute angle is an angle whose measure
  
  0
  0
• between 0 and 90.
• A

3
Obtuse Angle

• This angle measures between
• 0
  0
• 90 and 180.
• B
  

4
Right Angle

• 0
• This angle equals 90. It makes a corner
  angle.
• C

5
Straight Angle

• An angle that makes a straight line equals
• 180 degrees.
• D

6
A Reflex Angle

• A reflex angle is an angle whose measure is
  greater than 180 degrees.
• E

7
Measure these angles.Use your half circle
protractor.

• Angle A
  measures about
• _______
  degrees.

56
A
8

• Angle EDS measures

E
115 degrees.
D
S
9
Is this a right angle?

• Angle T measures about

88 degrees.
T
10
Use your full-circle protractor to measure each
angle.

• Angle G
  measures
• about
• Angle LEC
  measures
• about

L
C
E
35 degrees.
122 degrees.
G