Figure 1. Starting point: a 3.4.5 triangle with squares on its sides
(all measures in inches)

The perimeter of triangle ABC is 12 inches (3 + 4 + 5), the British imperial foot.
This is the origin of the measure.

The perimeter of the entire configuration is 36 inches, one yard
(3 + 3 + 3 + 4 + 4 + 4 + 5 + 5 + 5 = 36).
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