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In Cartesian Coordinates of the form (''x'',''y'') where it is frequently called ''abscissa'', the horizontal axis is conventionally used for the ''x'' coordinate, with Positive Number s extending to the right side of the vertical axis. The equation ''y''=''c'', where ''c'' a constant, represents a horizontal line. In an Complex Number , the horizontal axis is used for the real component. In perspective drawing, a set of Parallel horizontal lines extending from the same vicinity must ultimately meet at a single point on the horizon known as the Vanishing Point . This is a common feature of pictures of straight roads or railway lines. In construction, a Spirit Level helps orient structural members absolutely horizontal. SEE ALSO |
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