18ft in inches
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Formula
 * Side ^ 2 * Quantity * Price</br>Cost = _backslash_frac{1}{4}_backslash_sqrt{5(5%2B2_backslash_sqrt{5})} * Side ^ 2 * Quantity * Price</br>Cost = _backslash_frac{7}{4} cot(_backslash_frac{180°}{7}) * Side ^ 2 * Quantity * Price</br>Cost = _backslash_frac{5}{2}_backslash_sqrt{(5%2B2_backslash_sqrt{5})} * Side ^ 2 * Quantity * Price&ratio=1.4&maxWidth=884)