You find perimeter by adding all of the sides, which in this case is only 3 because it is a triangle. You also have to find consecutive even numbers. I don't know exactly how to tell you to find the answer, but what I did was divide 168 by 3, which gave me the number 56. By adding the even numbers on both sides of 56, I found the answer. The answer is 54, 56 and 58, when added equal to 168.