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theory.md

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Kreisausschnitt:
$r_1$ ... inner radius
$r_1$ ... outer radius
$\phi$ ... öffnungswinkel

geom. Schwerpunkt:

$\dfrac{2}{3} ; \dfrac{r_1^3-r_0^3}{r_1^2-r_0^2} ; \dfrac{1}{\phi} \cdot \begin{pmatrix} \sin(\phi) \ 1-\cos(\phi) \end{pmatrix}$