A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?
Perimeter of a square = 4(S) where S is each side of the square
Perimeter = 20(given)
4S = 20
S = \(\frac{20}{4}\) = 5
Area S\(^2\) = 5\(^2\) = 25
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