How many diagonals does a polygon with 13 sides have, if one of its vertices does not connect to any diagonal?	Choose the correct answer:	A) 65	B) 62	C) 58	D) 54	E) 60

Rationale: "if i calculate it using the formulae , # diagonals = n ( n - 3 ) / 2 each vertex sends of n - 3 diagonals n = 13 - 1 then 12 * ( 12 - 3 ) / 2 = 54 correct option : d"
Answer: D