Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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221140CHRISTIANI HUGENII& - 2 ly = - 2 {ιι/θ} - 2 l zz - xx + 2 {/θ} - {μμ/θθ}.
11De centro
O@CILLA-
TIONIS.
vel + θ yy = {ιι/θ} - 2 l zz - xx + 2 {/θ} - {μμ/θθ} + θ zz - θ x x
xm
- {μμ/θ}
.
+ 2 & - 2 ly = - 2{ιι/θ} + 2 l zz - xx + 2 {/θ} - {μμ/θθ}.
Ac
proinde, utroque caſu, pro θ y y - 2 l y habebitur - {ιι/θ}
+ θ z z - θ x x + 2 x m - {μμ/θ}.
Quò appoſitis reliquis quantita-
tibus
, ſumma prædicta contentis, θ x x - 2 x m + n n + k k,
fiet
tota ſumma, nempe quadratorum F A, F B, F C, F D,
= θ z z + nn + k k - {μμ - ιι/θ}.
Quod apparet eſſe planum da-
tum
, cum quantitates omnes datæ ſint;
ſemperque idem
reperiri
, ubicunque in circumferentia ſumptum fuerit pun-
ctum
F.
quod erat demonſtrandum.

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