Which of the following would you use when determining the ratio of a drawing to actual size?

When determining the ratio of a drawing to actual size, scales are the most appropriate tool to use. A scale provides a proportional relationship between the dimensions represented in a drawing and the actual dimensions in real life. For example, if a blueprint indicates that 1 inch on the drawing corresponds to 10 feet in reality, that specific scale allows for accurate interpretation of the drawing relative to the real-world context.

Using dimensions, formulas, or measurements alone does not yield an effective means of establishing this ratio since these terms are broader or require scale to derive the proportional relationships accurately. Dimensions refer to the size of elements in the drawing or real world, formulas might be used to calculate sizes or ratios but do not specify the drawing-to-real-life connection, and measurements involve taking size readings but lack the systematic relationship that scales provide. Therefore, scales are key to converting drawn measurements into real-world equivalents accurately.