Surface Area of an Ellipsoid

a, b, c: are the three axes from the origin of the ellipsoid.
The surface area of an ellipsoid is given by:

where p is given by 1.6075 approximately.
Note: this is only an approximate formula (Knud Thomsen's formula) with a relative error at most 1.061%.
(Reference: )
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Online Surface Area Calculator.
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