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What exactly is 85 centimeter? The perimeter is the sum of all sides - in the case of the rectangle, this is the same as twice the width, plus twice the height. p = 2w+2h, or p = 2(w+h). If you only know that one side of the rectangle is 85 cm, you simply don't have enough information to calculate the perimeter.

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Q: How do you work out the perimeter of a rectangle 85 cm?
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