is it half of an ellipsoid ?

Thanks for the link, I had never heard of an ellipsoid.

Reading further, it seems that the terms: ellipsoid of revolution and spheroid are specific version of an ellipsoid, and what I was trying to describe is properly terms an "oblate spheroid". Which has the simpler volume formula given by anonymonk below (or above).

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In reply to Re^2: [(way)OT] Formula for volume of a circular lens with an elliptical profile? by BrowserUk
in thread [(way)OT] Formula for volume of a circular lens with an elliptical profile? by BrowserUk

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