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Simplifying 12 = 2(3.14) * r Multiply 2 * 3.14 12 = 6.28r Solving 12 = 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. 12 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 12 + -6.28r = 0.00 Add '-12' to each side of the equation. 12 + -12 + -6.28r = 0.00 + -12 Combine like terms: 12 + -12 = 0 0 + -6.28r = 0.00 + -12 -6.28r = 0.00 + -12 Combine like terms: 0.00 + -12 = -12 -6.28r = -12 Divide each side by '-6.28'. r = 1.910828025 Simplifying r = 1.910828025
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