The width is 104. Now we need to find the length. 104 x 2 - 208. The length is 208. A rectangle has four sides, two of them are the length, and two of them are the width. To find the perimeter, we need to add all of them. 104 + 104 + 208 + 208 = 624.
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Substitute 6 into place and solving the answer gives you 4 which is indeed bigger than 3. All the other numbers will give you an answer of something lower than 3 which is not what we're looking for in this case.