The freshman class is selling trail mix to
raise money for penny pounds. They are
mixing chocolate that cost $2.25 per lb and
pretzels that cost $0.90 per pound. They
want to make 25 pounds of a mixture that
they can sell for $1.71 per pound. How much
chocolate do they need?

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