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Polygons and Perimeters: Activity 3 of 3

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You already know how to calculate the perimeter of a rectangle, using the formula P = S1 + S2 + S3 + S4. But there's another formula you can use to do the same thing. Let's figure it out.

Rectangles have opposite sides that are equal in length.

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Take another look at the picture to the left. Which of these formulas describes the perimeter of a rectangle?
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