300ft
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Perimeter is 40 feet.
It works out as: 90 feet Check: 2*(90+50) = 280 feet
It is 9+16+9+16 = 50 feet
Perimeter is 100', so each side = 25' and 25 squared = 625. QED
They could be almost anything. A strip of land 1 foot by 4000 feet would have a perimeter of 8002 feet. A plot 50 x 80, still 4000 square feet, would have a perimeter of 260 feet.