Angles and protractors

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint, called the vertex.

Front

What is a protractor used for?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures 90 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 find the measure of an angle using a protractor?

Back

Align the protractor's baseline with one ray of the angle, then read the measurement where the other ray crosses the protractor.

Front

If an angle measures 37 degrees, what type of angle is it?

Back

It is an acute angle.

Front

What is the sum of angles in a triangle?

Back

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

Front

If one angle in a triangle measures 28 degrees and another measures 152 degrees, what is the measure of the third angle?

Back

The third angle measures 0 degrees, which is not possible in a triangle.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.