Formula 10

\begin{array}{l} R_{B} = \sqrt{\frac{l_{e} \cdot d}{b^{2}}} = \sqrt{\frac{23.86 ft . \cdot 13.25 in . \cdot \frac{1 ft .}{12 in .}}{{(3.50 in .)}^{2}}} = \sqrt{2.15 ft .} = 1.47 ft \cdot \frac{12 in .}{1 ft .} \\ R_{B} = 17.60 in . \end{array}

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