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Mathematics

Ellipse Perimeter Calculator

Variable Legend

a= semi-major axisb= semi-minor axish= h = (a−b)²/(a+b)²

Ramanujan approximation

Accurate to within 0.0002% for typical ellipses.

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h parameter

Intermediate value used in the approximation.

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Deep Dive

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Mathematically verified
Reviewed October 2026
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