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A square of cardboard is taped at the perimeter by a piece of ribbon 20cm...

Mathematics
JAMB 1979

A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?

  • A. 20sq.cm
  • B. 100sq.cm
  • C. 25sq.cm
  • D. 16sq.cm
  • E. 36sq.cm
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Correct Answer: Option C
Explanation

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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