Brand A dish detergent costs $2.48 for 21 ounce bottle. Brand B costs $1.55 for a 12 ounce bottle Which brand costs less per ounce?

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