Surface area of a sphere equals 4 times the area of a circle with same radius.
Painting — Amount of paint for spherical objects.
Basketball covering — Leather panel calculations.
Earth surface — 510 million km².
Pressure vessels — Material needed for spherical tanks.
Balloon surface — Rubber needed for balloons.
Astronomy — Star luminosity depends on surface area.
Heat transfer — Spherical radiator design.
Medicine — Drug coating on spherical pills.
Golf ball dimples — Total dimple surface area.
Cell membranes — Spherical cell surface for nutrient exchange.
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