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Perimeter by definition is the length of the outside edge of an object. If you have a square, by defnition every side is equal so you only have to know one side's length. You then would multiply that side's length by 4 and you will have the perimeter. However, if you have an oval, there are no sides and this, of course does not apply. If you have a rectangle, there are two pair of sides that are equal. All you need to know is the length of the long and short side. Multiply both lengths by two and sum your answers.

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Q: Do you have to measure every side to work out the perimeter?
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