Measuring Angles with a Protractor

Front

What is a protractor?

Back

A protractor is a tool used to measure angles in 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, then read the degree measurement where the other side crosses the protractor.

Front

What is the measure of a right angle?

Back

A right angle measures 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

If an angle measures 20 degrees, what type of angle is it?

Back

It is an acute angle.

Front

If an angle measures 172 degrees, what type of angle is it?

Back

It is an obtuse angle.

Front

What is the measure of an angle that is complementary to a 30-degree angle?

Back

The complementary angle measures 60 degrees.

Front

What is the measure of an angle that is supplementary to a 110-degree angle?

Back

The supplementary angle measures 70 degrees.