// multi-utility computation suite · offline · instant · precise
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math.geometry-regular-polygon Calculator
Calculates interior angles, area, perimeter, and apothem of a regular polygon from side length or radius, for any number of sides. The apothem is the radius of the inscribed circle — useful for calculating the area of any regular polygon without trigonometry lookup.
Inputs
N
Count of items or occurrences.
S
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
R
Distance from centre to edge of a circle. Radius = diameter / 2.
Apothem
Reference formula or conversion factor shown for context.