Classifying and Naming Angles and Lines

Find the measure of the missing angle.

• 45 degrees

• 135 degrees

• 90 degrees

• 50 degrees

What type of angle is this? 

• acute

• obtuse

• right

Define Obtuse Angle

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

Define Acute Angle

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

Define Right Angle

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

Define Straight Angle

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

Right, acute, or obtuse?

• Right

• Acute

• Obtuse