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Horizontal : y = 0Vertical: x = 2.
For vertical lines, when you try to figure out the slope, you get zero in the denominator - in other words, a division by zero.
A triangle will always be composed of a minimum of one horizontal and one verticle line with a third line connecting them together. Therefore, it would be impossible to compose a "legal triangle" with three horizontal lines.
Verticle angles are angles opposite each other when two lines cross
the Horizontal line of you bed to the vertical lines of your bedposts