Clavius, Christoph, Geometria practica

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3. Non aliter aream conſequemur cuiuſcun que quadrilateri irregularis, et-
88Area figuræ
quadrilateræ

irregularis
.
iamſi non habeat omnes angulos introrſum, ſicut Trapezium.
Vt ſi in Trape-
zio
FGHI, ducantur ex G, &
I, duæ rectæ GK, IK, conſtituetur quadrilaterum
GHIK
, irregulare, cum ſolum habeat tres angulos GHI, HIK, HGK.
Nam ad
K
, non fit angulus GKI, introrſum verſus H, cum illud ſpatium ſit duo-
bus
rectis maius, ſed verſus F, extrorſum.
Huius ergo figuræ qua-
drilateræirregularis
aream colligemus, ducta diametro
K
H, ex duabus areis triangulorum IKH,
GKH
, vt de Trapezio FGHI,
dictum
eſt.

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