If the perimeter of an equilateral triangle is 6, then each side
has a length of 6 / 3 = 2. By the rules of a parallelogram (each
parallel side has the same length) you can see that the 2 short sides have
length 1 and the 2 long sides have length 2. So the
perimeter is
(2 * 1) + (2 * 2) = 6 (C).