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math.ellipse-area-perimeter Calculator
Calculates ellipse area (πab) and perimeter using Ramanujan's second approximation, with eccentricity and linear eccentricity. Ramanujan's formula (π × [3(a+b) − √((3a+b)(a+3b))]) is accurate to within 0.00001% for most ellipses.
Inputs
Semi Major A
Reference formula or conversion factor shown for context.
Semi Minor B
Reference formula or conversion factor shown for context.
Results
area
The computed two-dimensional surface area.
perimeter (Ramanujan)
The total boundary length of the shape.
eccentricity
Sample size or count used in the calculation.
focus distance c
The computed distance or separation.
A = πab
Reference formula or conversion factor shown for context.