Classifying Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What are the different types of angles based on their measures?

Back

The different types of angles based on their measures are: Acute (less than 90°), Right (exactly 90°), Obtuse (greater than 90° but less than 180°), Straight (exactly 180°), and Reflex (greater than 180° but less than 360°).

Front

What type of angle is less than 90 degrees?

Back

An acute angle.

Front

What type of angle is exactly 90 degrees?

Back

A right angle.

Front

What type of angle is greater than 90 degrees but less than 180 degrees?

Back

An obtuse angle.

Front

What type of angle is exactly 180 degrees?

Back

A straight angle.

Front

What type of angle is greater than 180 degrees but less than 360 degrees?

Back

A reflex angle.

Front

How can you identify an acute angle visually?

Back

An acute angle can be identified visually as it appears sharp and is smaller than a right angle.

Front

How can you identify an obtuse angle visually?

Back

An obtuse angle can be identified visually as it appears wider than a right angle.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.