Angles and Unit Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that meet at a common point called the vertex.

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Front

How many right angles make a full circle?

Back

4 right angles make a full circle (360 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 rotation in degrees?

Back

A full rotation is 360 degrees.

Front

Back

The measure is 36 degrees.

Front

Back

The measure is 108 degrees.

Front

What are parallel lines?

Back

Parallel lines are lines that never meet and are always the same distance apart.