1 x 100, 2 x 50, 4 x 25, 5 x 20, 10 x 10.
If sides do not need to be integral then you could have eg 8 x 12.5 or 40 x 2.5 etc
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100 x 100
1*100, 2*50, 4*25, 5*20, 10*10.
Infinitely many. Suppose the area of the rectangle is 100. We could create rectangles of different areas: 100x1 50x2 25x4 20x5 10x10 However, the side lengths need not be integers, which is why we can create infinitely many rectangles. Generally, if A is the area of the rectangle, and L, L/A are its dimensions, then the amount 2(L + (L/A)) can range from a given amount (min. occurs at L = sqrt(A), perimeter = 4sqrt(A)) to infinity.
10 by 10
One hectare is defined as an area of 10,000 square meters, or about 107,639 square feet. This doesn't tell you anything about its shape or linear dimensions. It could be a circle with a radius of about 56 meters, a square with 100-meter sides, millions of rectangles of different lengths and widths (just as long as the product of (length x width) is 10,000), or millions of other shapes.