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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376337Conicor. Lib. VII. guli ex ſumma extremorum, vel intermediorum in differentiam mini-
morum ſegmentorum, ſcilicet ex G A cum H E in E A.
Quia duplum rectanguli G A H cum duplo rectanguli G A E æquatur duplo
rectanguli ſub G A in H E, addito cõmuniter duplo rectanguli H E A erit du-
plum rectanguli G E H æquale duplo rectanguli G A H cum duplo rectanguli ex
ſumma G A, H E in E A;
& addito communi quadrato G H, erit duplum
rectanguli G E H cum quadrato G H, ſcilicet duo quadrata ex G E, &
ex E
446[Figure 446] H, erunt æqualia illis om-
nibus ſpatijs, ſcilicet duplo
rectanguli ex ſumma G A,
H E in E A cum duplo re-
ctanguli G A H ſimul cum
quadrato ex G H:
ſed duplo
rectanguli G A H cum quadrato G H æqualia ſunt duo quadrata ex G A,
&
ex A H, ergo duo quadrata ex G E, & ex E H æqualia erunt quadratis ex
G A, &
ex A H cum duplo rectanguli ex G A; & H E in E A, quod erat
oſtendendum.
LEMM A XII.
IN hyperbola, cuius axis A C, erectus A F, præſectæ C G, H A,
centrum D, atque diameter I L, eiuſque erectus I K, &
latus
C E, pariterque altera diameter Q P, cuius erectus P R, &
latus
C O:
dico quod duplum rectanguli ex G E cũ O H in H E à duobus
quadratis ex G E, &
ex E H; nec non quadrata Q P, & P R late-
rum figuræ diametri Q P à quadratis ex L I, &
ex I K, vel ex C A,
&
ex A F, vna deficiunt, aut vna æqualia ſunt, vel vna exce-
dunt.
447[Figure 447]

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