Perimeter of a circle. The ratio C/d = π was one of the first mathematical discoveries.
Bicycle wheels — One rotation travels C = 2πr distance.
Running tracks — Calculating lap distances.
Tire mileage — Odometer calculations from wheel rotations.
Fencing — Material needed for circular enclosures.
Belt drives — Pulley belt length calculations.
Clocks — Distance traveled by second hand tip.
Circular motion — Speed = distance/time = 2πr/T.
Cable reels — Wire length from number of turns.
Roller coasters — Loop circumference calculations.
Planetary orbits — Approximate orbit length.
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