Identify Angles

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint, called the vertex.

Front

What are the types of angles?

Back

The main types of angles are acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), straight (exactly 180°), and reflex (greater than 180°).

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Front

How do you identify an acute angle?

Back

An acute angle can be identified as being smaller than a right angle (90 degrees).

Front

How do you identify an obtuse angle?

Back

An obtuse angle can be identified as being larger than a right angle (90 degrees) but smaller than a straight angle (180 degrees).

Front

What is the vertex of an angle?

Back

The vertex of an angle is the point where the two rays meet.