1 m2 = 10.76 ft2
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There are infinitely many of them. The square of any multiple of four that is greater or equal to 12 will meet the requirement.
It has 4 and they all meet at right angles which is 90 degrees
An acre is a measure of area. It does not have to be rectangular in shape. And, given only the area, there are infinitely many configurations of length and breadth that will meet the requirements of the question.
A Rectangle!
One, though it's technically a square - hence why it is called a square pyramid. By definition, a square pyramid has one square face. It also has four triangular faces which meet at the apex (the tip) of the pyramid.