Ring (Geometrii)

Di toorus namt en rüm ${\displaystyle V}$  iin faan

${\displaystyle V=2\pi ^{2}r^{2}R}$ 

Si areaal ${\displaystyle A}$  bereegenst Dü mä

${\displaystyle A_{O}=2\pi r\cdot 2\pi R}$ 

of

${\displaystyle A_{O}=4\pi ^{2}rR}$ 

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