Parallel, Perpendicular and Skew Lines

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 skew lines?

Back

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

Front

How can you identify parallel lines in a diagram?

Back

Look for lines that are equidistant from each other and do not meet.

Front

What is the angle measure of a right angle?

Back

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

If line segment AD is parallel to line segment EH, what can be said about their slopes?

Back

Their slopes are equal.

Front

If line segment BC is perpendicular to line segment AB, what is the relationship between their slopes?

Back

The product of their slopes is -1.

Front

What is the best term to describe two lines that intersect at a 90-degree angle?

Back

Perpendicular lines.