Measuring Angles Using a Protractor

Front

What is a protractor?

Back

A protractor is a tool used to measure angles.

Front

What is the measure of a straight angle?

Back

A straight angle measures exactly 180 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 measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

How do you use a protractor to measure an angle?

Back

Align the baseline of the protractor with one side of the angle and read the measurement where the other side crosses the scale.

Front

What is the measure of a 90-degree angle?

Back

A 90-degree angle is known as a right angle.

Front

What is the measure of a 180-degree angle?

Back

A 180-degree angle is known as a straight angle.

Front

What is the measure of a 360-degree angle?

Back

A 360-degree angle is a full rotation.

Front

If an angle measures 11 degrees, what type of angle is it?

Back

It is an acute angle.