In a mathematical equation the dimension is the number of variables that are allowed to vary or that determine the result of the equation.
In the equation Y = 4X + 35 ==> the variable Y is the dependant variable and the variable X is the independent or free component (allowed to vary) and the equation has one dimension or degrees of freedom.
In the equation Y = 13A + BC + 15AD + XZ/13 + 1092 ==> The variable Y is the dependant variable and the 6 variables A, B, C, D, X and Z are the independent or free components (allowed to vary) and the equation has 6 dimensions or degrees of freedom.
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a dimension in math is a LENGTH, WIDTH, HEIGHT, BASE, or anything of the sort of a 2 or 3 D object/ shape
Length IS a dimension (in space). It has no thickness.
Lines that define the parameters of a dimension.Dimension lines are thin lines terminating in arrowheads. Place dimension lines no closer than 3/8" from the object outline. Parallel dimension lines should be a minimum of 1/4" apart. You may place parallel dimension lines more than 1/4" apart so long as the spacing between dimension lines is uniform throughout the drawing. Dimension lines are generally broken in the center of the line to provide a space for the dimension figure. Dimension figures for parallel dimension lines are staggered. In some structural or architectural drawings, you may find dimension figures placed above the dimension line.
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Basic dimension is the numerical value defining the theoretically exact size of a feature. Reference dimension is the numerical value enclosed in parentheses provided for information only and is not used in the fabrication of the part.
To find a missing dimension of an object find the size of its covering properties.