Types of Angles and Their Measures

Matt and Mr. J explain five types of angles: right, obtuse, acute, straight, and reflex. Right angles are 90 degrees, obtuse angles are between 90 and 180 degrees, acute angles are less than 90 degrees, straight angles are exactly 180 degrees, and reflex angles are between 180 and 360 degrees.

What is the measure of a right angle?

• 90 degrees

• 180 degrees

• 45 degrees

• 135 degrees

Which of the following is an obtuse angle?

• 180 degrees

• 135 degrees

• 90 degrees

• 45 degrees

An angle measuring 42 degrees is classified as what type of angle?

• Right angle

• Obtuse angle

• Acute angle

• Straight angle

What is the measure of a straight angle?

• 360 degrees

• 180 degrees

• 135 degrees

• 90 degrees

A reflex angle is greater than 180 degrees but less than what?

• 90 degrees

• 135 degrees

• 180 degrees

• 360 degrees