Protractors & Angles

Front

What is a protractor?

Back

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

Front

What is an angle?

Back

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

Front

What are the types of angles?

Back

The types of angles are acute (less than 90°), right (exactly 90°), obtuse (more than 90° but less than 180°), and straight (exactly 180°).

Front

How do you measure an angle with a protractor?

Back

To measure an angle, align the protractor's center point with the vertex of the angle and read the degree measurement where one ray crosses the protractor's scale.

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

What is a straight angle?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

If an angle measures 132°, what type of angle is it?

Back

It is an obtuse angle.

Front

What is the sum of angles in a triangle?

Back

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