Benedetti, Giovanni Battista de, Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]

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[397] Instrumentum oxigonium
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396384IO. BAPT. BENED. eiuſdem erit vt .a.d. ad .d.b. Idem etiam dico in ſecunda parabola, ſed ipſius .x.o. ad
o.r. eſt vt .a.b. ad .b.d. ex .6. ſexti Eucli.
vnde ex .11. quinti .n.f. ad .f.x. erit vt .ω.y.
ad
.y.g.
Sed in precedenti iam tibi dixi .a.b. mediam proportionalem eſſe inter .h.
et
.b.d.
Sit nunc .z. pro ſecunda parabola, ita ut .h. eſt pro prima, vnde .o.x. crit media
proportionalis
inter .z. et .o.r. & ex .11. quinti ita erit .h. ad .a.b. vt .z. ad .x.o. & ex .22.
h
. ad .a.x. ut z. ad .x.g. & quia ex .16. ſexti .a.x. media proportionalis eſt inter .h. et .f.
x
.
cum ſupponatur productum .h. in .f.x. æquale eſſe quadrato .a.x.
Idem dico .x.g.
mediam
eſſe proportionalem inter .z. et .g.y.
quare ex .11. iam dicta, ita erit .a.x. ad .f.
x
.
vt .y.g. ad .x.o. & ex eadem, ita erit ipſius .f.n. ad .a.b. ut .y.ω. ad .x.o. & ſic .f.n. ad .d.a.
vt
.y.ω. ad .x.r. ſed .f.m. ad f.n. eſt vt .y.t. ad .y.ω. ex .18. quinti vnde .f.m. ad .a.d. erit vt
y.t. ad .x.r.
Idem dico de eorum duplis.
437[Figure 437]

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