JAMB - Mathematics (1987 - No. 41)
An (\(n - 2)^2\) sided figure has n diagonals. Find the number n diagonals for a 25-sided figure
7
8
9
10
解释
(n-2)\(^2\)=25
n - 2 = 5
n = 5 + 2 = 7
n - 2 = 5
n = 5 + 2 = 7
An (\(n - 2)^2\) sided figure has n diagonals. Find the number n diagonals for a 25-sided figure