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Any number greater than or equal to 46.49 feet.

A circle with radius 7.4 feet (approx) is the smallest shape that has a perimeter of 46.49 feet and and area of 172 sq feet.

A square with sides of 13.11 feet (approx) has an area of 172 sq feet.

These shapes can be stretched and squashed so as to leave their areas unchanged (at 172 sq feet) but increase their perimeters without limit.

eg a rectangle of length 17200 feet and width 0.01 feet will have a perimeter of 34400.02 feet

a rectangle of length 17200000 feet and width 0.00001 feet will have a perimeter of 34400000.00002 feet

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Q: What is the perimeter of 172 square feet?
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