// multi-utility computation suite · offline · instant · precise
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math.geometry-sphere Calculator
Calculates volume (4/3πr³), surface area (4πr²), and great circle circumference of a sphere from its radius. Earth's surface area is 5.1×10¹⁴ m² — comparing any sphere to this gives an immediate sense of scale.
Inputs
R
Distance from centre to edge of a circle. Radius = diameter / 2.