if 4 foot is the circumference then the diameter is 4/pi = 1.27323954
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48First of all, you must have meant cubic feet (volume) not square feet.The area of a 2 ft. diameter pipe is 2*2*Pi/4 = Pi = 3.1416 sq.ft.The volume = area*length = 3.1416*12 = 37.6991cu.ft."Diameter" implies a round pipe.
Circumference = pi*diameter so diameter = circumference/pi = 40/pi = 12.7324 feet (to 4 dp)
Assuming you mean diameter, the answer is 8 feet.
I assume that you mean it's 4 ft in diameter, and you want to know the number of Sq Ft in the top. If so, the Area is equal to (Pi) X (Radius squared.) OR Since the Radius of a circle is 1/2 the Diameter ... the answer is [(4/2) X (4/2)] X Pi OR 4 X 3.14159 == 12.56636 Sq Ft
The surface of a circle is given by the formula d2pi/4, so for our 44 inch diameter table, that gives 484pi square inches, which is aproximately 1520.531 square inches.