Use geometric shapes, measurements, and properties to describe real-world objects.
Find the real measurement from a scale drawing or model
Problem
A drawing uses the scale \(1~\text{cm}:5~m\). If a length on the drawing is \(4~\text{cm}\), what real-world length does it represent?
Big Picture
What this problem is really about
Treat the scale as a conversion factor rather than as two numbers to combine arbitrarily. Orient the factor so the drawing unit cancels and the real-world unit remains, then multiply the measured drawing length by that factor. The surviving unit confirms both the direction of the conversion and the meaning of the result.
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