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Simplifying 28.26 = 4 * 3.14r2 Multiply 4 * 3.14 28.26 = 12.56r2 Solving 28.26 = 12.56r2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12.56r2' to each side of the equation. 28.26 + -12.56r2 = 12.56r2 + -12.56r2 Combine like terms: 12.56r2 + -12.56r2 = 0.00 28.26 + -12.56r2 = 0.00 Add '-28.26' to each side of the equation. 28.26 + -28.26 + -12.56r2 = 0.00 + -28.26 Combine like terms: 28.26 + -28.26 = 0.00 0.00 + -12.56r2 = 0.00 + -28.26 -12.56r2 = 0.00 + -28.26 Combine like terms: 0.00 + -28.26 = -28.26 -12.56r2 = -28.26 Divide each side by '-12.56'. r2 = 2.25 Simplifying r2 = 2.25 Take the square root of each side: r = {-1.5, 1.5}
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