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frew@mclean.com ttunit3bday1 > rectanglePerimeter
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Return the perimeter of the rectangle with the given length and width


rectanglePerimeter(1.1, 4.25) → 10.7
rectanglePerimeter(3, 4) → 14.0
rectanglePerimeter(10, 10) → 40.0

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public double rectanglePerimeter(double length, double width) { }

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