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We don't know. The perimeter doesn't uniquely define the dimensions.

It could be:

1 x 35

2 x 34

3 x 33

4 x 32

5 x 31

10 x 26

15 x 21

15.39 x 20.61

.

.

etc.

All of these rectangles have a perimeter of 72.

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Q: The perimeter of a rectangle is 72 what are the length and width?
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