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?
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A.
20sq.cm
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B.
100sq.cm
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C.
25sq.cm
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D.
16sq.cm
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E.
36sq.cm
Correct Answer: Option C
Explanation
Area of a square = 4(5) where S is each sides of the square
Perimeter = 20(given)
4S = 20
S = \(\frac{20}{4}\)
= 5
Area s2 = 52
= 25
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