Understanding Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet or intersect. They are always the same distance apart.

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

Give an example of parallel lines.

Back

Railroad tracks are an example of parallel lines.

Front

Give an example of perpendicular lines.

Back

The edges of a square are examples of perpendicular lines.

Front

What does it mean for two lines to intersect?

Back

To intersect means that two lines cross each other at a point.

Front

How can you identify perpendicular lines in a diagram?

Back

Perpendicular lines are often marked with a small square at the intersection to show that they form a right angle.

Front

What is the symbol used to represent parallel lines?

Back

The symbol for parallel lines is '||'. For example, if line AB is parallel to line CD, it is written as AB || CD.

Front

What is the symbol used to represent perpendicular lines?

Back

The symbol for perpendicular lines is '⊥'. For example, if line AB is perpendicular to line CD, it is written as AB ⊥ CD.

Front

Can two lines be both parallel and perpendicular?

Back

No, two lines cannot be both parallel and perpendicular. If they are parallel, they will never meet; if they are perpendicular, they will intersect at a right angle.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.