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

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LEMMA XI. PROP. LXXIX.
Si recta AB ſecta fuerit in C, & in D, ita vt AB ad BC, ſit vt
AD
ad DC:
Dico ſi BD bifariam ſecetur in E, punctum E cadere
inter
B, &
C, & rectangulum AEC, æquari quadrato ED.
CVm ſit enim AB ad BC, vt AD ad DC, erit permu-
114[Figure 114] tando BA ad AD, vt BC ad CD, ſed eſt BA ma-
ior
AD, quare BC erit maior CD:
ex quo punctum E
bifariam
ſecans BD cadit inter B, &
C.
Iam cum demonſtratum ſit eſſe BA ad AD, vt BC ad
CD
, erit BA ad AF, vt BC ad CD;
& componendo BF
ad
FA, vt BD ad DC;
& ſumptis antecedentium dimi-
dijs
, EA ad AF, ſiue ad AD, vt ED ad DC, &
per con-
uerſionem
rationis, AE ad ED, vt DE ad EC, vnde re-
ctãgulum
AEC ęquabitur quadrato ED.
Quod erat, & c.

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