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 does it mean for lines to intersect?

Back

Lines that cross each other at any angle.

Front

Give an example of parallel lines in real life.

Back

Railroad tracks.

Front

Give an example of perpendicular lines in real life.

Back

The corner of a square or rectangle.

Front

How can you identify parallel lines in a diagram?

Back

They will have arrows on them indicating they are parallel.

Front

How can you identify perpendicular lines in a diagram?

Back

They will form a square corner (90 degrees) where they intersect.

Front

What is the symbol for parallel lines?

Back

|| (two vertical lines)

Front

What is the symbol for perpendicular lines?

Back

⊥ (a small square at the intersection)

Front

If two lines are not parallel and not perpendicular, what are they called?

Back

Intersecting lines.