In plano pugna, necessario igitur figura plana, at non necessario figura talis, quae ad nullum corpus secum ipsa coeat, sed ideo solum talis quia ut corporibus physicis figurae respondent, quae solidumambeunt, sic planitiebus figurae quae solidum nonambeunt.
The battle is on the plane, so necessarily a flat shape, but not necessarily such a shape which combines with its own kind to come up against no body, but for that reason alone such shapes correspond to physical bodies whichencircle a solid, just as shapes which do notencircle a solid have flatness.
