Lines and Angles

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a ray?

Back

Part of a line with 1 endpoint and goes on forever.

Front

What is a line?

Back

A straight path that extends infinitely in both directions.

Front

What is an angle?

Back

A figure formed by two rays with a common endpoint.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What are intersecting lines?

Back

Lines that cross each other at any angle.