3. If solids be comprehended of homogeneall surfaces, equall in multitude and magnitude, they are equall. 10 d xj.
Equality of lines and surfaces was not informed by any peculiar rule; farther than out of reason and common sense, and in most places congruency and application was enough and did satisfie to the full: But here the congruency of Bodies is judged by their surfaces. Two cubes are equall, whose sixe sides or plaine surfaces, are equall, &c.
4. If solids be comprehended of surfaces in multitude equall and like, they are equall, 9 d xj.
This is a consectary drawne out of the general difinition of like figures, at the [19 e. iiij]. For there like figures were defined to be equiangled and proportionall in the shankes of the equall angles: But in like plaine solids the angles are esteemed to be equall out of the similitude of their like plaines: And the equall shankes are the same plaine surfaces, and therefore they are proportionall, equall and alike.
5 Like solids have a treble reason of their homologall sides, and two meane proportionalls. 33. p xj. 8 p xij.
It is a consectary drawne out of the [24 e. iiij]. as the example from thence repeated shall make manifest.
6 A solid is plaine or embosed.
7 A plaine solid is that which is comprehended of plaine surfaces.