Lines and Angles Vocabulary

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What are intersecting lines?

Back

Lines that cross each other but do not form right angles.

Front

What is an obtuse angle?

Back

An angle that measures greater than 90 degrees.

Front

What are parallel lines?

Back

Lines that will never cross each other.

Front

What are perpendicular lines?

Back

Lines that cross each other at right angles.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a transversal?

Back

A line that crosses two or more other lines.

Front

What is a reflex angle?

Back

An angle that measures more than 180 degrees but less than 360 degrees.