Measuring Angles

Front

What is an angle?

Back

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

Front

What is the vertex of an angle?

Back

The vertex is the point where the two rays of an angle meet.

Front

What is a protractor?

Back

A protractor is a tool used to measure 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 vertex of the angle, then read the measurement where one ray crosses the protractor's scale.

Front

What is the measure of a 30-degree angle?

Back

A 30-degree angle is an acute angle.