Marci of Kronland, Johannes Marcus - De proportione motus figurarum recti linearum et circuli quadratura ex motu

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1plagæ in db; erit motus quoq in de æqualis motui in dg: ac
proinde per prop: 31 motus medius reflectit per lineam dc.
Cùm igitur hæc ſit via centri, motus trianguli in ſe ipſum re
flectit.

THEOREMA II.

Motus trianguli Iſogoni ad planum, non verò ad baſim perpen
dicularis, in partem baſis maiorem reflectit.

Triangulum abc occurrat plano az ad angulos rectos:
ſecetque motus centri d baſim ac in duo ſegmenta kc maius,
& ka minus: dico motum reflexum fieri in partem kc ſe

gmenti maioris. Excitetur enim linea hypomochlij af: quam
ſecet linea de à centro perpendicularis quia itaque vectis eſt
da; atque huius quadratum, ideſt totam grauitatem, ſecat bi
fariam linea hypomochlij, iuxta demonſtrata in lib: de propor:
motûs; ſi quadratum ed fit grauitas mouens centri, erit hu
ius complementum quadratum ae, menſura percuſsionis ſcu

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