Parallel and Perpendicular Lines

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 shape has both parallel and perpendicular lines?

Back

A rectangle has both parallel and perpendicular lines.

Front

What shape has neither parallel nor perpendicular lines?

Back

A triangle can have neither parallel nor perpendicular lines.

Front

How can you identify parallel lines in a figure?

Back

Look for lines that are always the same distance apart and never touch.

Front

How can you identify perpendicular lines in a figure?

Back

Look for lines that cross each other to form right angles.

Front

What is an example of parallel lines in real life?

Back

The rails of a train track.

Front

What is an example of perpendicular lines in real life?

Back

The corners of a square or rectangle.

Front

If two lines are parallel, what can you say about their slopes?

Back

Their slopes are equal.

Front

If two lines are perpendicular, what can you say about their slopes?

Back

The product of their slopes is -1.