A nonagon based pyramid, perhaps.
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The square root of a square with side lengths of nine (9) is........................................................................................ 81! The formula is base(b) times height(h). So, 9 times 9 is 81.
Area = 0.5*15*9 = 67.5 square cm
This is because the side is not perpendicular to the base.
9 (base 10) = 1001 (base 2)
You can pick any side to be the base. It doesn't really matter.