4th Grade Angles

Front

What is an angle?

Back

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

Front

What is the vertex of an angle?

Back

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

Front

What is a protractor used for?

Back

A protractor is a tool used to measure angles in degrees.

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 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 measures exactly 180 degrees.

Front

How do you classify angles based on their measures?

Back

Angles can be classified as acute (less than 90°), right (90°), obtuse (more than 90° but less than 180°), or straight (180°).

Front

If an angle measures 125 degrees, what type of angle is it?

Back

It is an obtuse angle.

Front

If an angle measures 55 degrees, what type of angle is it?

Back

It is an acute angle.