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 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: -
Q:
## How many lines of symmetry does a triangle have?

A: The number of lines of symmetry a triangle has depends on the type of triangle. An equilateral triangle has three lines of symmetry, while an isosceles has... Full Answer >Filed Under: -
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:
## How many lines of symmetry does a decagon have?

A: A regular decagon has 10 lines of symmetry, one line drawn through each vertex and one line drawn through the midpoint of each edge. A line of symmetry ind... Full Answer >Filed Under: