The meaning of this question is not clear. A square is a two dimensional reqular quadrilateral - a flat shape with four sides of equal length. The lengths can have any value.
As such a square does not have a base, so it is not clear how the base of a square can have any length.
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Area for square is Base X Height. Since the length is all equal FOR a square The base and height is both 9cm So the answer is 81cm
yes
The area of the triangle in square meters is (1/2 the length of the triangle's base, in meters) times (the length of the triangle's height, in meters).
no
The base is different. A rect. pyramid has a rectangle as a base. Because the sides are different length for a rectangle, the triangles will not all be congruent (equal). A square pyramid has a square as the base. All sides of the square are the same length, so all the triangular sides of the pyramid will be congruent.