Measuring Angles with a Protractor

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

How do you measure an angle with a protractor?

Back

To measure an angle with a protractor, align the protractor's baseline with one side of the angle, then read the measurement where the other side crosses the protractor.

Front

What is the measure of a 25-degree angle?

Back

A 25-degree angle is an acute angle.

Front

What is the measure of a 65-degree angle?

Back

A 65-degree angle is an acute angle.

Front

What is the measure of a 21-degree angle?

Back

A 21-degree angle is an acute angle.

Front

What is the measure of a 172-degree angle?

Back

A 172-degree angle is an obtuse angle.

Front

What is the difference between acute and obtuse angles?

Back

Acute angles are less than 90 degrees, while obtuse angles are more than 90 degrees but less than 180 degrees.