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Simplifying 81650.99 = 2 * 3.14 * 2r + 2 * 314r * 287.9 Multiply 2 * 3.14 81650.99 = 6.28 * 2r + 2 * 314r * 287.9 Multiply 6.28 * 2 81650.99 = 12.56r + 2 * 314r * 287.9 Reorder the terms for easier multiplication: 81650.99 = 12.56r + 2 * 314 * 287.9r Multiply 2 * 314 81650.99 = 12.56r + 628 * 287.9r Multiply 628 * 287.9 81650.99 = 12.56r + 180801.2r Combine like terms: 12.56r + 180801.2r = 180813.76r 81650.99 = 180813.76r Solving 81650.99 = 180813.76r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-180813.76r' to each side of the equation. 81650.99 + -180813.76r = 180813.76r + -180813.76r Combine like terms: 180813.76r + -180813.76r = 0.00 81650.99 + -180813.76r = 0.00 Add '-81650.99' to each side of the equation. 81650.99 + -81650.99 + -180813.76r = 0.00 + -81650.99 Combine like terms: 81650.99 + -81650.99 = 0.00 0.00 + -180813.76r = 0.00 + -81650.99 -180813.76r = 0.00 + -81650.99 Combine like terms: 0.00 + -81650.99 = -81650.99 -180813.76r = -81650.99 Divide each side by '-180813.76'. r = 0.4515750903 Simplifying r = 0.4515750903
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