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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7563THEOREM. ARIT. ras confideranti ſpeculari licebit, Diametros harum figurarum notaui literis ſiue
characteribus
.a.e.i.c.u.n.
103[Figure 103] 104[Figure 104]
IN progreſſionibus, quæ ab alio termino quam vnitate incohantur, idipſum vt
monuimus
accidit, hoc tamen notato, quòd ex conſequenti quælibet pars dia-
metri
parallelogrammi, minimo termino æqualis erit, prout in progreſſionibus quæ
ab
vnitate originem ducunt, ſingulæ partes diametri, vnitati ſui primi termini æ-
quales
ſunt.
At in reliquis progreſſionibus, vt in figura patet, eadem eſt propor-
tio
totius diametri ad .o.n. quæ minimi termini ad vnitatem ex .13. quinti, nempe .
a
.o.
ad .o.n. vt .n.n.n.n. ad .n.
In eiuſmodi progreſſionibus accidit quoque parallelo-
grammum
à diametro in tres partes diuidi, quarum vnam ipſe occupat, reliquæ ve-
ro
inter ſe æquales ipſum ambiunt.
Ex quo illud etiam ſequitur, productum .a.o. in
dimidium
.o.n. æquale eſſe dimidio parallelogrammi, quod minus eſt ſumma progreſ-
ſionis
dimidio diametri, quod dimidum ſi inuenire voluerimus, minimum terminum .
n
.n.n.n.
per dimidium .o.n. multiplicabimus, & ex .18. aut .19. ſeptimi ipſum habe-
bimus
, quandoquidem minimo termino per totum .o.n. multiplicato profertur integer
diameter
ex .20. prædicti.
Etenim vt diximus, eadem eſt proportio totius diame-
tri
ad .o.n. quæ minimi termini ad vnitatem.
Ita etiam dico ex dicta .20. ſeptimi.
idem dimidium diametri oriri, ſi quis dimidium minimi termini nempè .n.n. per to
tum
.o.n. multiplicauerit.
Quamobrem qui ſtatim ſummam propoſitæ progreſſionis
cognoſcere
voluerit,
105[Figure 105] ſemper primum termi
num
.n.n.n.n. cum .a.o.
coniunget
, qua ſumma
per
dimidium .o.n. mul-
tiplicata
, aut .o.n. per
dimidium
dictæ ſum-
, ex prædictis rationibus propofitum conſequemur.

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