Apollonius <Pergaeus>, Apollonii Pergaei Conicorvm Lib. V. VI. VII. paraphraste Abalphato Asphahanensi : nunc primum editi ; additvs in calce Archimedis assvmptorvm liber, ex codibvs arabicis mss Abrahamus Ecchellensis Maronita latinos reddidit, Jo. Alfonsvs Borellvs curam in geometricis versione contulit & [et] notas vberiores in vniuersum opus adiecit

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152[Figure 152]
Quoniam proportio G E ad E I facta eſt, vt E C ad C F, & c. Nam
11b vt axis D C ad eius erectum, ſeu vt ſemiaxis E C ad ſemierectum C F, ita
facta
eſt E G ad G I:
ſed propter parallelas G V, & F C: & ſimilitudinem
triangulorum
E G V, E C F eſt E G ad G V, vt E C ad C F;
& propterea
eadem
E G ad duas G V, &
G I babebit eandem proportionem, & ideo I G æ-
qualis
erit G V, &
triangulum I G V iſoſceleum, & rectangulum erit in G;
quare quadratum I G duplum erit trianguli I G V: eſt verò quadratum B G
æquale
duplo trapezij G C F V;
ideſt duplo trapezij G C S V, cum duplo trian-
221. huius. guli F S V;
igitur quadratum I B (quod eſt æquale duobus quadratis I G, G
B
circa angulum rectum G) æquale eſt duplo trianguli I G V duplo trapezij

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