If you have the perimeter of a square, the outside is made of four equal sides.

After that I would draw in the diagonal and see that it forms a right triangle, you can also notice that it forms a 45 45 90 right triangle. From there, you can either use the Pythagorean theorem, take cos(45 degrees), or remember the relationship between the sides for a 45 45 90 triangle.

Three options.

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