Using a ruler, measure each side of the rectangle to determine the length and the width. In the above example, the length is 5 cm and the width is 2 cm. 4. Plug in the variables and solve the equation.

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Calculator Use. Use this calculator if you know 2 values for the rectangle, including 1 side length, along with area, perimeter or diagonals and you can calculate the other 3 rectangle variables.

To calculate the perimeter of the rectangle we have to add all four sides to the rectangle. In a rectangle, the total number of sides equals 4 therefore, its perimeter is defined as the sum of

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