Adding Angles and Subtracting Angles

Front

What is an angle?

Back

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

Front

What is the sum of angles in a triangle?

Back

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

Tags

CCSS.8.G.A.5

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90°.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Tags

CCSS.4.G.A.1

Front

How do you add angles?

Back

To add angles, simply sum their measures. For example, 30° + 60° = 90°.

Tags

CCSS.4.MD.C.7

Front

How do you subtract angles?

Back

To subtract angles, subtract the smaller angle from the larger angle. For example, 90° - 30° = 60°.

Tags

CCSS.4.MD.C.7

Front

What is a full angle?

Back

A full angle is an angle that measures 360°.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180°.

Tags

CCSS.4.G.A.1

Front

If one angle is 30° and another is 50°, what is their sum?

Back

30° + 50° = 80°.

Tags

CCSS.4.MD.C.7