Usually, yes.
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If you do not know the length or breadth of a rectangle, you cannot know the area. If you do not know the area of a rectangle, you cannot know the length and breadth. To know the length and breadth of a rectangle, you have to know some other contributing factor in the equation. If you don't, measure it!
Divide the area by the length of the rectangle
breadth multipied by the length
The answer will depend on what 64 feet represents and probably also what the breadth of the rectangle is.
perimeter of rectangle=2(l+b) l=length of the rectangle b=breadth of the rectangle