Types of lines

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What are horizontal lines?

Back

Lines that run left to right and are parallel to the horizon.

Front

What are vertical lines?

Back

Lines that run up and down and are perpendicular to horizontal lines.

Front

What are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

How can you identify perpendicular lines in a diagram?

Back

Look for a right angle (90 degrees) where the lines intersect.

Front

What is the relationship between horizontal and vertical lines?

Back

They are perpendicular to each other.

Front

Can parallel lines ever meet?

Back

No, parallel lines never meet or intersect.

Front

What is an example of perpendicular lines in real life?

Back

The edges of a square or rectangle.

Front

What is the slope of horizontal lines?

Back

The slope of horizontal lines is 0.

Front

What is the slope of vertical lines?

Back

The slope of vertical lines is undefined.