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The area of a square is 144 sq cm. Find the length of its diagonal

Mathematics
JAMB 1991
The area of a square is 144 sq cm. Find the length of its diagonal
  • A. 11\(\sqrt{3cm}\)
  • B. 12cm
  • C. 12\(\sqrt{2cm}\)
  • D. 13cm
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Correct Answer: Option C
Explanation
BD = \(\sqrt{x^2 + x^2}\)

= \(\sqrt{12^2 + 12^2}\)

= \(\sqrt{144 + 144}\)

= 2(144)

= 12\(\sqrt{2cm}\)
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