Angles on a Protractor - 4th Grade

Front

What is an angle?

Back

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

Front

What is a protractor used for?

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

90°

Tags

CCSS.4.G.A.1

Front

What is the measurement of a straight angle?

Back

180°

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 read a protractor?

Back

To read a protractor, align the baseline of the protractor with one side of the angle and read the measurement where the other side intersects the numbered scale.

Tags

CCSS.4.MD.C.6

Front

What is the measurement of a full rotation?

Back

A full rotation measures 360°.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is the measurement of a reflex angle?

Back

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

Tags

CCSS.4.G.A.1

Front

If an angle measures 75°, what type of angle is it?

Back

It is an acute angle.

Tags

CCSS.4.G.A.1