Classifying Angles

1
(No Transcript)
2
Classifying Angles

• Straight angles are angles that measure 180o.

3
Classifying Angles

• A right angle is an angle whose measure is 90o.

4
Classifying Angles

• An acute angle is a positive angle measuring less
  than 90o.

5
Classifying Angles

• An obtuse angle is an angle whose measure is
  greater than 90o and less than 180o.

6
How to Measure Angles

• Line up your protractor with the center on the
  vertex of the angle.
• Place the straight edge on one of the rays. This
  ray needs to begins at 0o.
• Now, look at the number on the other ray. This
  will tell you the degree of the angle.

7
How to Measure Angles
Here is an example of measuring a right angle.
vertex