A skydiver descends at 20 1/3 kilometers per hour after deploying its parachute. Which of the following expressions represents the change in the skydiver's altitude if they descend for 4/7 of an hour?

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's