Angles on protractor

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 a degree?

Back

A degree is a unit of measurement for angles. One full rotation is 360 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.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 a right angle?

Back

A right angle is an angle that measures exactly 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

What is a straight angle?

Back

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

Tags

CCSS.4.G.A.1

Front

How do you measure an angle with a protractor?

Back

Align the protractor's midpoint with the angle's vertex, then read the measurement where one ray crosses the protractor's scale.

Tags

CCSS.4.MD.C.6

Front

What is the measurement of a full rotation?

Back

A full rotation measures 360 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What type of angle is 160 degrees?

Back

160 degrees is an obtuse angle.

Tags

CCSS.4.G.A.1