Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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Junctâ porro Φ Π, conſtat ſemiparabolam Π Φ N ad trian-
gulum
Π Φ N eſſe ut 4 ad@ 3;
ſed triangulus Π Φ N eſt ad
rectangulum
Φ P ut 1 ad 6, (eſt enim baſis Π N tertia pars
ipſius
N P) hoc eſt, ut 3 ad 18.
Ergo ex æquo erit ſemi-
parab
.
Π Φ N ad rectang. Φ P ut 4 ad 18. Itaque & ſemi-
cylindrus
Φ B N eſt ad parallelepipedum ejuſdem altitudinis
ſuper
baſi Φ P, ut 4 ad 18.
Dictiautem parallelepipedi di-
midium
eſt priſma D N S;
ergo ſemicylindrus Φ B N eſt ad
priſma
D N S, ut 4 ad 9, hoc eſt, ut 60 ut 135.
Qua-
lium
igitur partium dimidiata ungula D A C B erat 8, ta-
lium
ſemicylindrus parab.
Φ B N erat 60, (ut ſuprà oſten-
ſum
eſt) taliumque priſma D N S erit 135.
Ac proinde ſo-
lidum
A Π S D, quod ex iſtis tribus componitur, erit 203.
Eſt autem ungula dimidiata A D C B ad dimidiatam un-
gulam
E A P Π, ut 1 ad 32, ſicut Cl.
Vir. demonſtravit in
prop
.
95. lib. 9. Ergo qualium partium ungula dimid.

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