Area enclosed by a circle of radius r. Derived by integrating 2πr from 0 to r.
Pizza sizing — 12" pizza has 44% more area than 10" pizza.
Land measurement — Circular plot area for pricing.
Pipe flow — Flow rate proportional to πr² (cross-sectional area).
Wheel design — Tire contact patch calculations.
Pool covers — Material needed for circular pools.
Satellite dishes — Signal collection area.
Circular gardens — Fencing and planting calculations.
Manhole covers — Why they're circular: can't fall through.
Compact discs — Data storage density.
Cell biology — Cell membrane surface area.
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