Parallel, perpendicular, skew lines

Front

What are parallel lines?

Back

Two lines that never cross.

Front

What are perpendicular lines?

Back

Two lines that intersect at 90 degrees.

Front

What are skew lines?

Back

Lines that do not intersect and are not parallel, existing in different planes.

Front

Identify the relationship: Lines A and B do not intersect and are always the same distance apart. What are they?

Back

Parallel lines.

Front

Identify the relationship: Lines C and D intersect at a right angle. What are they?

Back

Perpendicular lines.

Front

If line AB is parallel to line CD, what can be said about their slopes?

Back

Their slopes are equal.

Front

If line FG is perpendicular to line EH, what is the relationship between their slopes?

Back

The product of their slopes is -1.

Front

Which lines are skew?

Back

Lines that are not parallel and do not intersect.

Front

Name a line parallel to line XY.

Back

Any line that does not intersect XY and is in the same plane.

Front

Name a line perpendicular to line PQ.

Back

Any line that intersects PQ at a right angle.