Adding and Subtracting Angles Part 1

Front

What is an angle?

Back

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

Front

What is the unit of measurement for angles?

Back

Angles are measured in degrees (°).

Front

What is a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is a right angle?

Back

A right angle measures 90 degrees.

Front

What is an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

How do you add angles?

Back

To add angles, simply sum their degree measures.

Front

How do you subtract angles?

Back

To subtract angles, subtract their degree measures.

Front

What tool is used to measure angles?

Back

A protractor is used to measure angles.

Front

If angle A measures 40° and angle B measures 60°, what is the sum of angle A and angle B?

Back

Angle A + Angle B = 40° + 60° = 100°.