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2*(5 + 20) cm = 2*25 cm = 50 cm.

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Q: What are the 5 20 cm rectangles in perimeter?
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What are all possible rectangles with a perimeter of 26 cm and whole number lenthes of sides?

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What is the perimeter of a square with sides of 5 cm?

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What is the area of a square with a perimeter of 20 centimeters?

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How do i sketch and label all possible rectangles with a perimeter of 30 cm and sides whose lengths are whole numbers?

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You can't tell the area from knowing the perimeter. There are an infinite number of different rectangles, all with the same perimeter, that all have different areas. Here are a few rectangles that all have perimeters of 42. The last number after each one is its area: 1 cm by 20 cm . . . . . 20 square centimeters 2 x 19 . . . . . 38 3 x 18 . . . . . 54 4 x 17 . . . . . 68 5 x 16 . . . . . 80 10 x 11 . . . 110


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