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$ d= 2\cdot r $
$ r= \frac{d}{2} $
$ A = r^{2} \cdot \pi $
$ r = \sqrt{\frac{A}{\pi }} $
$ U = 2\cdot r\cdot \pi $
$ r = \frac{ U}{2\cdot \pi } $
Geometrie-Kreis-Kreis
$d= 2\cdot r$
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$r= \frac{d}{2}$
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$A = r^{2} \cdot \pi$
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$r = \sqrt{\frac{A}{\pi }}$
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$U = 2\cdot r\cdot \pi$
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$r = \frac{ U}{2\cdot \pi }$
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Beispiel Nr: 16
$\begin{array}{l}
\text{Gegeben:}\\\text{Durchmesser} \qquad d \qquad [m] \\
\\ \text{Gesucht:} \\\text{Radius} \qquad r \qquad [m] \\
\\ r= \frac{d}{2}\\ \textbf{Gegeben:} \\ d=\frac{4}{7}m \qquad \\ \\ \textbf{Rechnung:} \\
r= \frac{d}{2} \\
d=\frac{4}{7}m\\
r= \frac{\frac{4}{7}m}{2}\\\\r=\frac{2}{7}m
\\\\\\ \small \begin{array}{|l|} \hline d=\\ \hline \frac{4}{7} m \\ \hline 5\frac{5}{7} dm \\ \hline 57\frac{1}{7} cm \\ \hline 571\frac{3}{7} mm \\ \hline 571428\frac{4}{7} \mu m \\ \hline \end{array} \small \begin{array}{|l|} \hline r=\\ \hline \frac{2}{7} m \\ \hline 2\frac{6}{7} dm \\ \hline 28\frac{4}{7} cm \\ \hline 285\frac{5}{7} mm \\ \hline 285714\frac{2}{7} \mu m \\ \hline \end{array} \end{array}$