What does not need to be included in a diagram scale?

A precise calculation of measurements is not necessary to be included in a diagram scale because the purpose of a scale in a diagram is to represent proportions rather than to provide exact numeric measurements. A scale typically indicates how a specific unit of measurement in the diagram corresponds to actual measurements in reality.

Including a statement like "not drawn to scale" helps to inform the viewer that the depiction might not accurately reflect real-world measurements, while the scale of the drawing provides a reference point for understanding its dimensions. A descriptive legend helps in clarifying symbols and elements shown in the diagram, enhancing comprehension for individuals reviewing the diagram. Therefore, while precision may be important in executing a drawing, it is not a requirement for the scale itself.