About 7/8 foot
The diameter of a 72-inch round table is 72 inches, as the term "diameter" refers to the distance across the table through its center. This means that if you measure from one edge of the table to the opposite edge, it will be 72 inches.
The number of people that can fit at a 10-foot diameter round table depends on the amount of space each person needs. Typically, you can fit about 6 to 8 people comfortably around such a table, allowing for enough space for dining and movement. If you’re aiming for a more crowded arrangement, you might fit up to 10 people, but this could compromise comfort.
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.
Eight Feet will give each person plenty of room
The diameter of a 72-inch round table is 72 inches, as the term "diameter" refers to the distance across the table through its center. This means that if you measure from one edge of the table to the opposite edge, it will be 72 inches.
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.
The number of people that can fit at a 10-foot diameter round table depends on the amount of space each person needs. Typically, you can fit about 6 to 8 people comfortably around such a table, allowing for enough space for dining and movement. If you’re aiming for a more crowded arrangement, you might fit up to 10 people, but this could compromise comfort.
Circumference = 72*pi
c = 3.14 x the diameter
if 4 foot is the circumference then the diameter is 4/pi = 1.27323954