49 sq. cm

Explanation

Since all four sides of a square are equal, the perimeter of a square is four times its side. So the side of the square = 28/4 = 7 cm. The area of a \(\text { square }=\text { side } \times \text { side }=7 \times 7=49 \text { sq. } \mathrm{cm} .\)

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