About 7/8 foot
c = 3.14 x the diameter
Circumference = 72*pi
According to eHow, your base area must support at least 1/3 of the table top area.
25pi
A table which is 90 inch around its outside (circumference) is 28.648 inches (to 3 dp) across (diameter).
Eight Feet will give each person plenty of room
If the table is 60 inches across, the diameter is 60 inches.
234
9'0" Diameter
It is 1.91 feet.
Circumference = 72*pi
To accurately measure a round table, use a measuring tape to find the diameter by measuring straight across the center of the table. Multiply the diameter by 3.14 (pi) to find the circumference.
Circumference = 72*pi
c = 3.14 x the diameter
if 4 foot is the circumference then the diameter is 4/pi = 1.27323954
According to eHow, your base area must support at least 1/3 of the table top area.
The table would have to be at east ten feet in diameter.