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

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THEOR. VIII. PROP. XVI.
Sirecta linea ſemi-Parabolen ad extremum baſis contingens
cum
diametro conueniat, &
intra ipſam ſuper eadem baſi deſcri-
pta
ſit Parabole, cuius diameter ſit dimidium diametri ſemi-Para-
bolæ
, ac ei æquidiſtet;
erit trilineum à contingente, producta dia-
metro
, &
conuexa ſemi-Parabolica linea contentum, æquale tri-
lineo
à diametro, conuexa Parabolica, &
concaua ſemi-Parabo-
lica
comprehenſo.
Per continuam igitur biſectionem, diuidatur contingens AE, vel baſis AC
in
quotcunq;
partes æquales CD, DL, LM, MF & c. : & per diuiſionum pun-
cta
D, L, M, F, &
c. ducãtur ipſi CBE æquidiſtantes D1, L2, M3, F4, & c. quæ
ſemi-Parabolen
ſecent in Q, R, K, H &
c. Parabolen verò in N, O, P, G, & c. ;
&
ex B, Q, R, K & c. : ducantur BY, QZ, R& , KI & c. : ipſi AE parallelæ, quæ
intra
ſemi-Parabolen ABC cadent (cum ſint contingenti æquidiſtantes) vel
extra
trilineum AEBHA.
Hac ergo methodo circumſcribetur trilineo figu-
ra
EBYZ&
I & c. ex æquè altis parallelogrammis & c.

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