Angles on a 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.

Front

What is the range of degrees for angles?

Back

Angles can measure from 0 degrees to 360 degrees.

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

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 degree scale.

Front

What is the measure of a full rotation?

Back

A full rotation measures 360 degrees.

Front

What is the measure of a half rotation?

Back

A half rotation measures 180 degrees.