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 in real life.

Back

Examples of parallel lines include the edges of a ruler or the rails of a train track.

Front

Give an example of perpendicular lines in real life.

Back

Examples of perpendicular lines include the corner of a square or the intersection of a street.

Front

What is the symbol used to denote 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 denote 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

If line segment AB is perpendicular to line segment CD, what can we say about the angles formed?

Back

The angles formed at the intersection of AB and CD are right angles (90 degrees).

Front

How can you identify parallel lines on a graph?

Back

On a graph, parallel lines have the same slope but different y-intercepts.

Front

How can you identify perpendicular lines on a graph?

Back

On a graph, perpendicular lines have slopes that are negative reciprocals of each other.

Front

What is the relationship between parallel lines and distance?

Back

The distance between parallel lines remains constant, no matter how far they are extended.