Originally Posted by

**daigo** If you haven't learned about squares and roots yet, you might have an easier time knowing that the sides of a square are all the same, so divide the perimeter evenly between 4 sides (i.e. 20 / 4) and you should get the length of one side, which is the same as the length of all the sides (since it's a square).

Then the general area of a rectangle (a square is just a special rectangle that has all of the same sides) is length multiplied by width, so just multiply the length by the width and that's your area (for a square it's just one side multiplied by any other side, since all the sides are the same, it doesn't matter which sides you use).