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 measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is the measure of 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 side of the angle and read the measurement where the other side crosses the scale.

Front

What is the total measure of angles in a triangle?

Back

The total measure of angles in a triangle is always 180 degrees.

Front

What is a reflex angle?

Back

A reflex angle measures more than 180 degrees but less than 360 degrees.

Front

What is the difference between complementary and supplementary angles?

Back

Complementary angles add up to 90 degrees, while supplementary angles add up to 180 degrees.