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The perimeter of a square is 4 * the length of a side, and the area is the length of a side squared. So, since you want the two things to be equal, you can set up an equation: 4s = s2.

In this case, we can assume that s is positive and non-zero, since we're looking for the length of something that exists, so in this instance, we can divide both sides by our variable s. (You can't always make this assumption in algebra.) Doing so, we get s = 4. So a square that has sides of length 4 has an equal perimeter and area.

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Q: How can the perimeter and area be the same?
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