Angles on a Protractor

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

Front

What is a protractor used for?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is the measure of an obtuse angle?

Back

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

Front

How do you read a protractor?

Back

To read a protractor, align the baseline of the protractor with one side of the angle and read the measurement where the other side crosses the numbered scale.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is a full rotation in degrees?

Back

A full rotation is 360 degrees.

Front

If an angle measures 100 degrees, what type of angle is it?

Back

It is an obtuse angle.

Front

If an angle measures 45 degrees, what type of angle is it?

Back

It is an acute angle.