parallel and perpendicular lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet; 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

What does it mean for lines to intersect?

Back

Lines intersect when they cross each other at a point.

Front

What is the point of intersection?

Back

The point of intersection is the point where two lines meet or cross.

Front

How can you identify parallel lines in a diagram?

Back

Parallel lines can be identified in a diagram by looking for lines that are equidistant and never meet.

Front

How can you identify perpendicular lines in a diagram?

Back

Perpendicular lines can be identified in a diagram by looking for lines that form a right angle (90 degrees) at their intersection.

Front

What is the relationship between the slopes of parallel lines?

Back

The slopes of parallel lines are equal.

Front

What is the relationship between the slopes of perpendicular lines?

Back

The slopes of perpendicular lines are negative reciprocals of each other.

Front

What is an example of intersecting lines?

Back

An example of intersecting lines is the hands of a clock, which cross at various times.

Front

What is a transversal line?

Back

A transversal line is a line that crosses two or more other lines in the same plane.