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Simplifying S = 4(3.14)(r * r) Multiply r * r S = 4 * 3.14(r2) Multiply 4 * 3.14 S = 12.56r2 Solving S = 12.56r2 Solving for variable 'S'. Move all terms containing S to the left, all other terms to the right. Simplifying S = 12.56r2
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