Understanding and measuring angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

Front

What unit is used to measure angles?

Back

Angles are measured in degrees.

Front

What is a protractor?

Back

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

Front

How many degrees are in 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

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is a full angle?

Back

A full angle measures 360 degrees.

Front

How do you measure an angle using a protractor?

Back

Align the protractor's center point with the angle's vertex and read the measurement where one ray crosses the protractor's scale.

Front

If angle A measures 50 degrees, what type of angle is it?

Back

Angle A is an acute angle.