Scale (ratio)  

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The scale ratio of some sort of model which represents an original proportionally is the ratio of a linear dimension of the model to the same dimension of the original. Examples include a 3-dimensional scale model of a building or the scale drawings of the elevations or plans of a building. In such cases the scale is dimensionless and exact throughout the model or drawing. The scale can be expressed in four ways: in words (a lexical scale), as a ratio, as a fraction and as a graphical (bar) scale. Thus on an architect's drawing we might read

'one centimetre to one metre'    or    1:100   or    1/100

and a bar scale would also normally appear on the drawing. [[File:Da Vinci Vitruve Luc Viatour.jpg|thumb|right|Da Vinci's Vitruvian Man illustrates the ratios of the dimensions of the human body; a human figure is often used to illustrate the scale of architectural or engineering drawings.]]

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