CAP. II. De ſtereometria,

I Pr'yumidz Sofidietem iuveftigare:

Pyramis eſt vel criazgalaris, vel quadangęularu, utriusque Soliditas eo- dem modo inveſtigatur; Baſis aream inveſtigatan multiplica cum tertia altitudinis parte,& erir quæſitum

II. Priſmate dato, ſoliditztem ejus ex- plonareæ: ſi prismatus haſis babet latens pamllela, tunc baſis area h. m. inveni-

1„l„, KTurr tatcra paraens n. unam ſum-

mam collige, collectæſummæ dimi-

dium multiplica per perpendicularé,

&exp orara erit area baſis, hanc areã

multiplica per alcitudinem, produ- ckum oſtender prismatis ſolidiratem. Sin baſis mon habes latem gamllela ſed abliquangula, tunc duos perpendicu-

lares ex angulis oppoſitis indiagona-

lem demitte juxta probl. VII. cap z. earundemque aggregatum multiplica per ſemiſſem diagonalis& conſtabit baſis area, quam poſtmodum multi- plica per altituduem,& erit ſoliditas,

III. Da⸗