A dimension is a measurable extent of some kind, such as length, breadth, depth, or height.
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A dimension that exactly locates a reference point, reference line, or reference plane
2d shape is a dimension
The definition to an Extension Line is:A line used to visually connect the ends of a dimension line to the relevant feature on the part.How Extension Lines are used:Extension lines are solid and are drawn perpendicular to the dimension line.- DarKeneD
it has no dimension
The scale factor between two similar shapes is the ratio of the dimensions of one (often the smaller) compared with the dimension of the other (the larger).