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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[286] Pro Lunæ occaſu. Ad lati .45.
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376364IO. BAPT. BENED.
Mutio Groto.
Sedre vera non putabam te indigere aliqua demonſtratione, quod linea .b.h. di-
uiſa
ſit per æqualia à linea .c.a. cum hæc perpendicularis ſit ab .a. ad baſim .g.d. in triam
gulo
orthogonio .g.a.d. & cum ſit .b.h. perpendicularis ad .a.o. ex ſuppoſito quæ .a.
o
.
in ſe habet punctum medium baſis .g.d. nec non illud anguli recti .a. quod per ſe cla
riſſimum
eſt, cum iam ſcis .o. eſſe centrum circuli circundantis triangulum .g.a.d. or-
thogonium
, et .g.d. eius diameter, vnde .o.a. æquabitur ipſi .o.g. quapropter angulus
o
. am. g. æquabitur angulo .g. ex quinta primi,
deinde ex .32. eiuſdem, angulus .h. æqua
bitur
angulo .d. eo quod an gulus .e. rectus eſt, quemadmodum et .a. ſed angulus .d.
æqualis
eſt angulo .g.a.c.
& propterea angulus .h. erit etiam æqualis angulo .h.a.u.
vnde
.h.u. æqualis erit ipſi .u.
a
.
ex .6. primi, cum poſtea angulus .
417[Figure 417] o.a.d.
æqualis ſitangulo .d. ex quin­
ta
primi erit angulus .a.b.e. æqua-
lis
angulo .g. ex .32. dicta, eo quod
e
. rectus eſt, & ex eadem æqualis
erit
angulo .d.a.c. vnde .u.b. erit
æqualis
ipſi .u.a. ex .6. dicti, & ideo
æqualis
eric ipſi .u.h.
Reliqua ve-
illius propoſitionis credo ex te
omnia
poſſe intelligere, excepto, quod
vt
tibi ſignificaui ſi à puncto .i. com-
muni
ipſi .a.c.u. & circunferentiæ,
ducta
fuerit .i.x. ad punctum .x. com
mune
vni parallelæ à puncto .g. ipſi
h.b. & circunferentiæ, quod di-
cta
.i.x. ad rectos erit ipſi .a.b.d. eo
quod
cum angulus .a.g.x. æqualis

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