Protractor Practice

Front

What is a protractor?

Back

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

Front

How do you read a protractor?

Back

To read a protractor, align the baseline of the angle with the 0° line of the protractor and look at where the other side of the angle intersects the numbered scale.

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180°.

Front

What is an acute angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180° but less than 360°.

Front

How do you find the measure of an angle using a protractor?

Back

Place the protractor's center point on the vertex of the angle, align one side with the baseline, and read the measurement where the other side intersects the scale.

Front

What is the sum of angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

What is the difference between complementary and supplementary angles?

Back

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