en.wikipedia.org/wiki/Horizontal_and_vertical

The usage of the inter-related terms **horizontal** and **vertical** as well as their
symmetries and asymmetries vary with ...

answers.yahoo.com/question/index?qid=20080529120831AAuuq7K

a **horizontal line** goes in the same direction as the horizon like the line below. A
**vertical** line goes up and down like a flag pole ...

www.reference.com/math/difference-between-vertical-horizontal-lines-9e8e73a2eba24c24

**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 ...

mathforum.org/library/drmath/view/57310.html

What is the **difference between** an undefined slope and a slope of zero? ... A
**horizontal line** has a slope which is the number zero. You might be ... If a line is
just one degree away from being **vertical** then its slope is about 57.

mathforum.org/cgraph/cslope/horizontal.html

Horizontal and **Vertical** Lines. Lines that never slant up or down are called
**horizontal lines**. Here is a picture of some **horizontal lines**: ...

math.stackexchange.com/questions/836969/difference-between-horizontal-and-vertical-line-tests

Jun 17, 2014 **...** The **vertical** line test is to check if a curve is a function. ... and the **horizontal line**
test checks whether the inverse of that curve is a function.

smallbusiness.chron.com/difference-between-vertical-horizontal-business-organizations-24915.html

The **Difference Between Vertical** & **Horizontal** Business Organizations ... such
that the **lines** of responsibility and control are clear and the function of each layer
...

growthdevil.com/differences-horizontal-vertical-distribution

**Horizontal** and **vertical** distribution are opposite business models. These terms
are used somewhat loosely, and sometimes 'distribution' is replaced with scaling
...