Any sheet of paper in the An series - A4 being the most common size for printers and copiers.
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No not all rectangles are similar because the proportions are different.
There would be an infinite number of rectangles possible
Number of factor pairs = number of rectangles
false
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. So, there are 5 rectangles with an area of 36 cm^2 is 5.