Measuring Angles with A Protractor

Front

What is an angle?

Back

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

Front

What tool do we use to measure angles?

Back

A protractor is used to measure angles in degrees.

Front

What is the measurement 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

How do you read a protractor?

Back

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

Front

If an angle measures 35 degrees, is it acute, obtuse, or straight?

Back

It is an acute angle.

Front

If an angle measures 132 degrees, is it acute, obtuse, or straight?

Back

It is an obtuse angle.

Front

What is the measure of a full rotation in degrees?

Back

A full rotation measures 360 degrees.