A small plane is at a height of 1800 m when it starts descending to land.
The plane's height changes at an average
rate of 150 m per minute. Write an equation that relates to the height to the time.

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