For 10 points, name this measure of a solid, equal for a sphere to four times pi times the radius squared.
Shrake and Rupley introduced a rolling ball algorithm to calculate a form of this quantity applied to biomolecules that had been developed earlier by Lee and Richards. The polar form of this quantity should be limited to sixty square angstroms for molecules intended to cross the blood-brain barrier. Schwarz demonstrated that different methods of approximating this quantity, unlike (*) arc length, as using limiting polyhedra can give different values. This quantity is infinite in Gabriel's horn, and the folds formed by the mitochondrial inner membrane exist to maximize this quantity. Its ratio to volume is minimized for the sphere. For 10 points, name this measure of a solid, equal for a sphere to four times pi times the radius squared.
Shrake and Rupley introduced a rolling ball algorithm to calculate a form of this quantity applied to biomolecules that had been developed earlier by Lee and Richards.
surface {area}