A kite is a four-sided polygon with two sets of equal side. If we let x be the length of the first two sides, we represent the length of the second set as 2x-5. Given the perimeter,
P = 2L + 2W
8 = 2(x) + 2(2x - 5)
The value of x is 3. Thus, the sides of the kite measure 3 cm, 3 cm, 1 cm, and 1 cm.