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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AN PENTAGONVS AB ALBERTO DVRERO
deſcriptus
æquiangulus ſit.
Conrado Neubart.
Ducatur deinde perpendicularis .a.e. ad .o.d. quæ vt ſinus anguli .a.o.e. erit par-
tium
.86602. talium qualium .a.o. erit .100000. quæ quidem .o.a. vt chorda arcus .a.
o
.
eſt partium .51762. talium qualium .a.d. vel .a.c. ſemidiameter eſt .100000.
Nam ſinus dimidij arcus .a.o. (exi
ſtente
.a.o. graduum .30.) eſt partium .
423[Figure 423] 25881.
ex quo .a.e. erit partium .
44827
.
talium qualium .a.d. erit
100000
. vnde angulus .a.d.o. cuius ſi
nus
eſt .a.e. erit graduum .26. min .38
qui
quidem angulus, ſumptus cum an
gulo
.a.o.d. erit gra .86. min .38.
Dem
pta
denique hac ſumma ex duobus
rectis
gra .180. reliquum erit gra .93.
min
.22. ideſt angulus .o.a.d. cui addi
tus
cum fuerit angulus .o.a.c. gra .15.
talium
, habebimus angulum .c.a.d.
graduum
.108. min .22. exuperantem
verum
angulum pentagoni per min .
22
.
vel ſic, cum inuentus fuerit angu-
lus
.a.d.o. gra .26. min .38. ſi ex vno re
cto
demptus fuerit, relinquetur an-
gulus
.d.a.e. gra .63. min .22. qui qui-
dem
collectus cum fuer it cum angu-
lo
.e.a.o. reſiduo ex re cto dempto angulo .a.o.e. grad .60. qui .e.a.o. eſt grad .30. &

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