If you are given the width and the perimeter, then figure out what the length is then calculate the area... hope this helps :)
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Length = (Perimeter - twice width) / 2
Divide the perimeter by 4 and then square the result to find the area of the square.
If the area is already given, there should also be either width or length given. Do the area, divided by the length or the width. For example, the area divided by the width equal the length. Hope it helps.
i think you find the square root of the area. that's the length and the width, so you multiply it.
You can't. There are an infinite number of possible rectangles with a given area.