2719
_Decima figura._
Angulus dodecagoni æquilateri ABD.
OPERATIO SEXTA.
Praeterea, vbi deſcribenda eſſet ichno-
graphia arcis vel propugnaculi, in eadem qui-
dem proportione quàm alia, verùm illâ major
vel minor. Verbigratia, ſi vellemus deſcribe-
reichnographiam arcis quarta parte majoris
alia, veluti ſi prima quatuor paſſuum eſſet, al-
tera verò deberet eſſe quinque, vt ſunt duæ li-
neæ AB, A, -- B, & CD, C -- D,
& linea AB prior ſit paſſuum 4, linea verò CD
paſſuum 5, tertia linea erit ea, in qua facta eſt
ſcala primæ ichnographiæ, quæ fieri debebit
major vel minor. Statuamus autem eam eſſe
graphia arcis vel propugnaculi, in eadem qui-
dem proportione quàm alia, verùm illâ major
vel minor. Verbigratia, ſi vellemus deſcribe-
reichnographiam arcis quarta parte majoris
alia, veluti ſi prima quatuor paſſuum eſſet, al-
tera verò deberet eſſe quinque, vt ſunt duæ li-
neæ AB, A, -- B, & CD, C -- D,
& linea AB prior ſit paſſuum 4, linea verò CD
paſſuum 5, tertia linea erit ea, in qua facta eſt
ſcala primæ ichnographiæ, quæ fieri debebit
major vel minor. Statuamus autem eam eſſe
zoom in
zoom out
zoom area
full page
page width
set mark
remove mark
get reference
digilib