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

A right angle measures 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is the measurement of an acute angle?

Back

An acute angle measures less than 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is the measurement of an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

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 ray of the angle and read the measurement where the other ray crosses the numbered scale.

Tags

CCSS.4.MD.C.6

Front

What is the sum of angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Tags

CCSS.8.G.A.5

Front

What is a full rotation in degrees?

Back

A full rotation is 360 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is a reflex angle?

Back

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

Tags

CCSS.4.G.A.1