Area of a circle with a 4 feet radius = 16*pi square feet
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Assuming the diameter is 4 feet, then the radius is half. 4 / 2 = 2 ft.
4 foot square has 4 feet on each side. Area=4*4=16 sq. ft. Perimeter=4+4+4+4=16 ft.
4*16=64 ft.2
4 pie ft. 2
77.5 sq. ft.