A polygon has 54 diagonals. How many sides does it have?
Self made Choose the correct choice from the following answers: A) 12 B) 13 C) 14 D) 15 E) 16
The best way to solve this problem is to use the formula: An n sided polygon can have n*(n - 3)/2 diagonals   n*(n - 3)/2 = 54   n*(n - 3) = 108   Substitute n from the answer choices. n = 12   12nswer: 12
<result>A</result>
A polygon has 54 diagonals. How many sides does it have?
Self made