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An (n - 2)2 sided figure has n diagonals. Find the number n diagonals for...

Mathematics
JAMB 1987
An (n - 2)2 sided figure has n diagonals. Find the number n diagonals for 25-sided figure
  • A. 7
  • B. 8
  • C. 9
  • D. 10
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Correct Answer: Option A
Explanation
(n - 2)2 = 25

n - 2 = 25 = 5

n = 5 + 2

= 7
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