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Simplifying 18.81 = 2r * 3.14 Reorder the terms for easier multiplication: 18.81 = 2 * 3.14r Multiply 2 * 3.14 18.81 = 6.28r Solving 18.81 = 6.28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28r' to each side of the equation. 18.81 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 18.81 + -6.28r = 0.00 Add '-18.81' to each side of the equation. 18.81 + -18.81 + -6.28r = 0.00 + -18.81 Combine like terms: 18.81 + -18.81 = 0.00 0.00 + -6.28r = 0.00 + -18.81 -6.28r = 0.00 + -18.81 Combine like terms: 0.00 + -18.81 = -18.81 -6.28r = -18.81 Divide each side by '-6.28'. r = 2.99522293 Simplifying r = 2.99522293
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