// multi-utility computation suite · offline · instant · precise
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math.geometry-circle Calculator
Calculates area, circumference, arc length, and sector area of a circle from the radius, and computes the chord length for a given central angle. π = C/d for any circle — this is where the constant was first defined.
Inputs
R
Distance from centre to edge of a circle. Radius = diameter / 2.
Deg
Reference formula or conversion factor shown for context.