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Simplifying 137.8 = 2r * 3.14 Reorder the terms for easier multiplication: 137.8 = 2 * 3.14r Multiply 2 * 3.14 137.8 = 6.28r Solving 137.8 = 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. 137.8 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 137.8 + -6.28r = 0.00 Add '-137.8' to each side of the equation. 137.8 + -137.8 + -6.28r = 0.00 + -137.8 Combine like terms: 137.8 + -137.8 = 0.0 0.0 + -6.28r = 0.00 + -137.8 -6.28r = 0.00 + -137.8 Combine like terms: 0.00 + -137.8 = -137.8 -6.28r = -137.8 Divide each side by '-6.28'. r = 21.94267516 Simplifying r = 21.94267516
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