Classify Angles

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

How can you identify a right angle?

Back

A right angle can be identified by its square corner or by using a protractor to measure 90 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What type of angle is formed by two rays that point in opposite directions?

Back

The angle formed is a straight angle, which measures exactly 180 degrees.

Front

If an angle measures 45 degrees, what type of angle is it?

Back

It is an acute angle.

Front

If an angle measures 120 degrees, what type of angle is it?

Back

It is an obtuse angle.

Front

What is the relationship between acute angles and right angles?

Back

Acute angles are smaller than right angles.

Front

What is the relationship between obtuse angles and right angles?

Back

Obtuse angles are larger than right angles.