Measuring Angles Using 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 measure of a straight angle?

Back

180 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is the measure of a right angle?

Back

90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

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, then read the measurement where the other side crosses the protractor.

Tags

CCSS.4.MD.C.6

Front

What is the measure of a full rotation?

Back

360 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is the measure of a reflex angle?

Back

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

Tags

CCSS.4.G.A.1

Front

If an angle measures 45 degrees, what type of angle is it?

Back

It is an acute angle.

Tags

CCSS.4.G.A.1

Front

If an angle measures 120 degrees, what type of angle is it?

Back

It is an obtuse angle.

Tags

CCSS.4.G.A.1