Measuring Angles Using a Protractor

Front

What is a protractor?

Back

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

Front

What is the measure of a right angle?

Back

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 use a protractor to measure an angle?

Back

Align the baseline of the protractor with one side of the angle, then read the measurement where the other side intersects the protractor.

Front

What is the measure of a full rotation?

Back

A full rotation measures 360 degrees.

Front

What is the difference between complementary and supplementary angles?

Back

Complementary angles add up to 90 degrees, while supplementary angles add up to 180 degrees.

Front

If one angle measures 30 degrees, what is the measure of its complementary angle?

Back

60 degrees.

Front

If one angle measures 120 degrees, what is the measure of its supplementary angle?

Back

60 degrees.