measuring angles with protactor

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?

Back

A protractor is a tool used to measure angles in degrees.

Front

How many degrees are in a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is an acute angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

How do you use a protractor to measure an angle?

Back

Align the midpoint of the protractor with the vertex of the angle, then read the degree measure where one ray crosses the protractor.

Front

What is the measure of a full rotation?

Back

A full rotation measures 360 degrees.

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.

Front

If an angle measures 65 degrees, what type of angle is it?

Back

It is an acute angle.