What size is a 4ft round table?

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