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

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### Quick Answer

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.

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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.

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

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Full Answer >**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 one line of symmetry, and a scalene triangle has none.Filed Under: -
Q:
## Why don't contour lines cross?

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Full Answer >**Contour lines do not ever cross one another because each line represents a different elevation on a topographic map.**However, contour lines may merge in the case of a vertical cliff.Filed Under: -
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## What are some geometric shapes found in nature?

A:Geometric shapes found in nature include pentagons, hexagons, spirals, waves and lines. These shapes are fascinating examples of mathematical laws being manifested by natural or biological means.

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Q:
## How many lines of symmetry are in a circle?

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Full Answer >**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 Euclidean shape with this property.Filed Under: