Measuring Angles with a Protractor

Front

What is a protractor?

Back

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

Tags

CCSS.4.MD.C.6

Front

What is the measurement of a right angle?

Back

90º.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle measures exactly 180º.

Tags

CCSS.4.G.A.1

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.

Tags

CCSS.4.MD.C.6

Front

What is the measurement of a full rotation?

Back

A full rotation measures 360º.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is the difference between acute and obtuse angles?

Back

Acute angles are less than 90º, while obtuse angles are more than 90º but less than 180º.

Tags

CCSS.4.G.A.1

Front

What is the measurement of a reflex angle?

Back

A reflex angle is an angle that measures more than 180º but less than 360º.

Tags

CCSS.4.G.A.1

Front

What is the sum of angles in a triangle?

Back

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

Tags

CCSS.8.G.A.5