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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.

Take another look at the picture to the left. Which of these formulas describes the perimeter of a rectangle?
Question 1 of 10