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Simplifying 81650.99 = 2 * 3.14 * 2r + 2 * 3.14r * 287.9 Multiply 2 * 3.14 81650.99 = 6.28 * 2r + 2 * 3.14r * 287.9 Multiply 6.28 * 2 81650.99 = 12.56r + 2 * 3.14r * 287.9 Reorder the terms for easier multiplication: 81650.99 = 12.56r + 2 * 3.14 * 287.9r Multiply 2 * 3.14 81650.99 = 12.56r + 6.28 * 287.9r Multiply 6.28 * 287.9 81650.99 = 12.56r + 1808.012r Combine like terms: 12.56r + 1808.012r = 1820.572r 81650.99 = 1820.572r Solving 81650.99 = 1820.572r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1820.572r' to each side of the equation. 81650.99 + -1820.572r = 1820.572r + -1820.572r Combine like terms: 1820.572r + -1820.572r = 0.000 81650.99 + -1820.572r = 0.000 Add '-81650.99' to each side of the equation. 81650.99 + -81650.99 + -1820.572r = 0.000 + -81650.99 Combine like terms: 81650.99 + -81650.99 = 0.00 0.00 + -1820.572r = 0.000 + -81650.99 -1820.572r = 0.000 + -81650.99 Combine like terms: 0.000 + -81650.99 = -81650.99 -1820.572r = -81650.99 Divide each side by '-1820.572'. r = 44.84908589 Simplifying r = 44.84908589
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