Types of Angles and Lines

Front

What is a ray?

Back

A part of a line that has one endpoint and goes on endlessly in one direction.

Front

What is an obtuse angle?

Back

An angle that is greater than 90 degrees and less than 180 degrees.

Front

What type of lines are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

What is a line?

Back

A straight path that extends in both directions forever.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What are intersecting lines?

Back

Lines that cross each other at one point.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a perpendicular line?

Back

Lines that intersect to form a right angle.

Front

What is an acute angle?

Back

An angle that is less than 90 degrees.

Front

What is the term for angles that add up to 180 degrees?

Back

Supplementary angles.