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Simplifying 630.0096 = 2 * 3.14 * 19.36 + 2 * 3.14 * 4.4r Multiply 2 * 3.14 630.0096 = 6.28 * 19.36 + 2 * 3.14 * 4.4r Multiply 6.28 * 19.36 630.0096 = 121.5808 + 2 * 3.14 * 4.4r Multiply 2 * 3.14 630.0096 = 121.5808 + 6.28 * 4.4r Multiply 6.28 * 4.4 630.0096 = 121.5808 + 27.632r Solving 630.0096 = 121.5808 + 27.632r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27.632r' to each side of the equation. 630.0096 + -27.632r = 121.5808 + 27.632r + -27.632r Combine like terms: 27.632r + -27.632r = 0.000 630.0096 + -27.632r = 121.5808 + 0.000 630.0096 + -27.632r = 121.5808 Add '-630.0096' to each side of the equation. 630.0096 + -630.0096 + -27.632r = 121.5808 + -630.0096 Combine like terms: 630.0096 + -630.0096 = 0.0000 0.0000 + -27.632r = 121.5808 + -630.0096 -27.632r = 121.5808 + -630.0096 Combine like terms: 121.5808 + -630.0096 = -508.4288 -27.632r = -508.4288 Divide each side by '-27.632'. r = 18.4 Simplifying r = 18.4
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