Measuring with a Protractor

Front

What is a protractor?

Back

A tool that measures angles.

Front

What is the measure of a right angle?

Back

90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

How do you measure an angle with a protractor?

Back

Place the center of the protractor on the vertex of the angle and align one side with the zero line.

Front

What is the measure of a full rotation?

Back

360 degrees.

Front

What is the measure of a half rotation?

Back

180 degrees.

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.

Front

What is the measure of a 45-degree angle?

Back

It is an acute angle.