The perimeter is the length of the outside edge. Imagine you start walking around the edge of that shape, starting in the bottom left corner and walking up first.
You’d walk 9 yd, turn right walk 19 yd, turn right walk 9 yd, turn right walk 4 yd, turn right walk 6 yd, turn left walk 11 yd, turn left walk 6 yd, turn right walk 4 yd and be back to where you started.
How far did you walk?
9+19+9+4+6+11+6+4 = 68 yds