a SAT math question

题目

a SAT math question
on a square gameboard that is divided into n rows of n squares each ,k of these square lie along the boundry of the gameboard.which of the following is a possible value for
10
25
34
42
52

答案

It should be 52.
一个正方形棋盘分分成N列,每列有N个小正方形.
如果棋盘的周长由K个小正方形组成,请问K的值为多少?
(There's one more thing I wanna mention.For the title,it must be "an SAT" but not "a SAT",right?S is a vowel.)