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JAMB - Mathematics (1987 - No. 22)

An (n - 2)2 sided figure has n diagonals. Find the number n diagonals for 25-sided figure
7
8
9
10

Explication

(n - 2)2 = 25

n - 2 = 25 = 5

n = 5 + 2

= 7

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