709 square feet
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The area is 21*31 = 651 square feet.
Area: 43*57 = 2451 square feet Perimeter: 43+57+43+57 = 200 feet
You have two 43-ft sides = 86-ft and two 20-ft sides = 40-ft. Total perimeter = 126-ft.
If its diameter is 43 ft then its circumference is pi*43 = 135.088 ft to 3 dp
21-ft x 22-ft = 462 ft2