Measuring Angles Using a Protractor

Front

What is a protractor?

Back

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

Front

How do you align a protractor to measure an angle?

Back

The vertex of the angle should be aligned with the center point of the protractor, and the baseline of the protractor should be aligned with one ray of the angle.

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 21 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 first step in measuring an angle with a protractor?

Back

Place the center point of the protractor at the vertex of the angle.

Front

What should you check after measuring an angle with a protractor?

Back

Ensure that the baseline of the protractor is aligned with one ray of the angle.