Measuring Angles with 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 the measure of an acute angle?

Back

An acute angle is less than 90 degrees.

Front

What is the measure of an obtuse angle?

Back

An obtuse angle is greater than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle measures 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 and read the measurement where the other side crosses the protractor.

Front

What is the measure of a full rotation?

Back

360 degrees.

Front

If an angle measures 0 degrees, what type of angle is it?

Back

It is called a zero angle.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.

Front

What is a complementary angle?

Back

Two angles that add up to 90 degrees are called complementary angles.