Q:
# What is the difference between vertical and horizontal lines?

Horizontal lines are parallel to the horizon or parallel to level ground. They have a slope of zero and are parallel to the x-axis on a graph. Vertical lines are perpendicular to the horizon, parallel to the y-axis on a graph and have undefined slope.

Continue Reading
Credit:
julienbelli
CC-BY 2.0

The term "horizontal" derives from the Latin "horizontem" which means "flat." The term "vertical" derives from the Latin "vertex," which means "highest point."

The slope of a line refers to the change in the rise, or y-value, divided by the run, or the change in x-value. Because a horizontal line does not change in y-value with changes in x-value, its slope may be calculated as zero divided by any number. This results in a slope of zero. For vertical lines, the slope equation leads to a division by zero, which is undefined.

Learn more about Shapes-
Q:
## How many lines of symmetry are in a circle?

A: Circles have an infinite number of lines of symmetry. Any line that bisects a circle through its center is a line of symmetry. Circles are the only Euclide... Full Answer >Filed Under: -
Q:
## What shapes have no lines of symmetry?

A: Some shapes that have no lines of symmetry include the scalene triangle and trapezium. A trapezium is a four-sided flat shape with straight sides, none of ... Full Answer >Filed Under: -
Q:
## What is a six-sided shape called?

A: A six-sided shape is called a hexagon as long as all six sides are straight lines and the lines connect to make one closed shape. If it does not close or h... Full Answer >Filed Under: -
Q:
## How many lines of symmetry does a hexagon have?

A: A regular hexagon with six equal sides has six lines of symmetry. For all regular polygons, the number of lines of symmetry is equal to the number of sides... Full Answer >Filed Under: