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Simplifying 8.5 = 3.14 * 2r Multiply 3.14 * 2 8.5 = 6.28r Solving 8.5 = 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. 8.5 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 8.5 + -6.28r = 0.00 Add '-8.5' to each side of the equation. 8.5 + -8.5 + -6.28r = 0.00 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + -6.28r = 0.00 + -8.5 -6.28r = 0.00 + -8.5 Combine like terms: 0.00 + -8.5 = -8.5 -6.28r = -8.5 Divide each side by '-6.28'. r = 1.353503185 Simplifying r = 1.353503185
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