[tex]L =\pi \: r(r + 2t) \\ \\ \frac{1}{2} ( \frac{L}{\pi \: r} - r) = t \\ \\ \frac{L}{2\pi \: r} - \frac{r}{2} = t \: (B)[/tex]
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[tex]L =\pi \: r(r + 2t) \\ \\ \frac{1}{2} ( \frac{L}{\pi \: r} - r) = t \\ \\ \frac{L}{2\pi \: r} - \frac{r}{2} = t \: (B)[/tex]
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