Viviani, Vincenzo, De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei

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LEMMA II. PROP. II.
263[Figure 263]
Ductis enim rectis ex G, F ad omnes àngulos polygoni, vt in ſiguris:
Patet ipſum polygonum vtrinque diuiſum eſſe in duos triangulorum ordines
æquales
altitudineshabentium, quæ ſunt ipſa polygonilatera, ſuper quæ ca-
dunt
perpendiculares, (ſinempe accipiantur tanquam baſes) erit ergo
aggregatum
baſiun triangulorum, quæ ſimul conueniunt in F, ad aggre-
gatum
baſium triangulorum, quæ conueniunt in G, vt aggregatum 11per pri-
mam
Ap-
pend
.
gulorum, primiordinisex F, ad aggregatum triangulornm ſecundi ex G,
ſed
hęc triangulorumaggregata in prima figura ſunt æqualia (namipſa idem
polygonum
complent) ergo, &
aggregata baſium eorundem, hoc eſt ag-
gregata
perpendicularium ex F, &
G, ſuper polygoni latera

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