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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326314IO. BABPT. BENED.
Sint exempli gratia duæ propoſitæ ſuperflcies .c.y. duo verò anguli dati ſint .r.s.
cum
voluerimus inuenire duo triangula (quæ ſint .a.i.u. et .n.t.x. ) tali conditio-
ne
prædita, quod angulus, a. æqualis ſit angulo .s. & angulus .t. angulo .r. & quod
angulus
.x. ſimul cum angulo .u. æ-
quentur
duobus rectis, & quod triam
349[Figure 349] gulum .a.i.u. æquale ſit ſuperficiei .
c
.
reliquum verò ſuperficiei .y.
Ex
duabus ſuperficiebus .c. et .y.
conſtituemus
duo quadrata, per vl
timam
ſecundi Eucli. accipiemus,
deinde duo latera tetragonica ip-
ſorum
quadratorum, & inuenie-
mus
tertiam lineam in continua
proportionalitate
cum illis lateri-
bus
ex .10. ſexti, ſeruabimus po-
ſtea
extremas illarum, quæ ſint .z.
et
.l. quarum proportio, eadem erit,
quæ
inter duas propoſitas ſuperfi-
cies
reperitur ex .18. ſexti, accipie
mus
, deinde lineam aliquam cu-
inſuis
longitudinis, quæ ſit .q.g. ſu-
pra
quam conſtituemus in puncto
q
. angulum .m.q.g. ęqualem angu-
lo
.s. & angulum .m.q.K. æqualem
angulo
.r. ex .23. primi, poſtea ve-
à quouis puncto ipſius lineæ .q.
m
.
puta .o. ducetur .o.f. vſque ad .q.
g
.
quorſum volueris, producendo
ipſam
vſque;. ad .d. ita quod propor-
tio
f.o. ad .o.d. ſit vt .z. ad .l. ex .10.
ſexti
, ducendo poſtea à puncto .d.
lineam
.d.h.E. parallelam lineæ .q.
g
.
& quia ex .2. primi Vitellionis .
h
.E.
ſecatur ab .q.K. in puncto .b.
protrahemus
.b.o.p. vnde ex ſimi-
litudine
triangulorum habebimus
proportionem
.p.o. ad .o.b. vt .f.o.

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