The area of the square is 144 cm2, which is the area of which the side is 3 cm smaller.

A square is a quadrangle in which all sides are equal and the corners are right.

Its area is determined by the formula: S = a², we find the unknown side, provided that the area is 144 cm²:

a = √144 = 12 cm.

For a square with a side 3 cm less: 12 – 3 = 9 cm:

S = 9² = 81 cm².

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