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Area and perimeter situations

Problem

Milo wants to put a fence around the dog park near his house. He measures the sides and finds they are 7, start text, space, m, end text and 8, start text, space, m, end text long. He multiplies 7, times, 2 and 8, times, 2 and finds he needs 30, start text, space, m, end text of fencing.
Which measurement does 30, start text, space, m, end text represent?
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