Apart from a few special facts, such as the calculation of the radius of a circle circumscribing a known isosceles triangle, the substance of Babylonian geometry was a collection of rules for the areas of simple plane figures, in­cluding regular polygons, and the volumes of simple solids. The geometry was not studied in and for itself but always in connection with practical problems.

The word “substance” in the passage is closest in meaning to?

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