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Two tiles can only make one rectangle.
Four.And a rectangle can only be 2d.
To find the area of a rectangle, you multiply the length by the width (one side by a different side) Or you could count how many centimeter squares make up the rectangle
If you can only make one rectangle, your number's prime. If you can make more than one, it's composite.
Any prime can be made into only one rectangle. Any composite number can always be made into at least two different rectangles.