Defining scale on drawings: Scale is stated as a ratio comparing the number of drawing units to the number of actual units (for example, 1:2, 2:1). Is this the correct description of scale notation?

Introduction / Context:
Engineers and designers use scale to fit large or small objects onto standard sheet sizes without losing clarity. Scale notation expresses a relationship between the plotted size and the real-world size. This item checks whether describing scale as a ratio of drawing units to actual units is accurate.

Given Data / Assumptions:

• Common notations: 1:1 (full), 1:2 (half-size), 2:1 (double-size).
• Units remain consistent on both sides of the ratio.
• Dimensions state true values independent of plotted scale.

Concept / Approach:
A scale ratio communicates how measurements on paper relate to real size. Writing “1:2” means 1 drawing unit represents 2 actual units (reduced). Writing “2:1” means 2 drawing units represent 1 actual unit (enlarged). This definition is correct across disciplines as long as the units on both sides are the same system.

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