... possess, on cones and cylinders on the one hand, and on circles and polygons on the other hand, may finally be integrated and brought to bear on the sphere. Following the brief “interlude” of Propositions122 on ... is that the force of the conditional will be of the form“if an action is done, a certain object results.” Only at the end of the setting-out, it is seen that the force of the conditional is ... the surface of the <cone> AB to itsown base, so the base of the <cone> HK to the base of the <cone>MN, [(11) for the base of the <cone> AB is equal to the base of...