basic geometry

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

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

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a ray?

Back

A part of a line that starts at a point and goes off in one direction infinitely.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is the difference between a line and a line segment?

Back

A line goes on forever in both directions, while a line segment has two endpoints.

Front

What do we call two lines that never intersect?

Back

Parallel lines.