10795
PROPOSITIO XXIX.
Si ſuper eadem baſi &
circa eandem diametrum ſint quælibet
figura & parallelogrammum ipſam circumſcribens. Cy-
lindrus ex parallelogrammo ad ſolidum ex figura, reuolutis
ambobus circa parallelam diametro ductam velper extre-
mitatem baſis, vel extra baſim, erit vt parallelogram-
mum ad figur am.
45[Figure 45]figura & parallelogrammum ipſam circumſcribens. Cy-
lindrus ex parallelogrammo ad ſolidum ex figura, reuolutis
ambobus circa parallelam diametro ductam velper extre-
mitatem baſis, vel extra baſim, erit vt parallelogram-
mum ad figur am.
SVper eadem baſi A C, &
circa eandem dia-
metrum B D, ſint quælibet figura A B C, &
parallelogrammum E C, ipſam circumſcribens
& intelligamus ambas figuras prius rotari circa F C.
Dico cylindrum E G, eſſe ad ſolidum ex figura,
A B C, circa eandem F C, quod ſit A B C H G, vt
E C, ad A B C. Accipiatur in B D, arbitrariè
punctum 1, per quod intelligantur tranſire in
figuris linea k N, A C, parallela, in ſolidis
metrum B D, ſint quælibet figura A B C, &
parallelogrammum E C, ipſam circumſcribens
& intelligamus ambas figuras prius rotari circa F C.
Dico cylindrum E G, eſſe ad ſolidum ex figura,
A B C, circa eandem F C, quod ſit A B C H G, vt
E C, ad A B C. Accipiatur in B D, arbitrariè
punctum 1, per quod intelligantur tranſire in
figuris linea k N, A C, parallela, in ſolidis