It depends on the size of the table. And this is true of any table shape. What you must consider is when you are sitting at the table, are you able to push back completely and get up easily without your chair hitting the wall behind you. That is the amount of clearance necessary for everyone seated at the table to be comfortable and not cramped. Comfort and erase of movement in the room is a common sense way to make your decision. And if the table cramps the room, it is going to look like it doesn't belong there. Sometimes you can keep a center leaf out to make the table smaller day to day. Then on those special occasions like Thanksgiving when nobody has accommodations for so many people, you add back the leaf and crowd in. It is one of those exceptions to the rule!
For banquets, a 6 ft (72inch) round table is typically used to seat 10 people comfortably
The number of chairs around a dining room table depends on the size of the table. Tables can fit anywhere from two chairs and more. Round tables may fit more chairs comfortably than square or rectangular tables.
The size of the table is not the primary concern, it's the size of the room. Speak to a Lighting By Pecaso lighting consultant for free. They answer these questions all the time via email, chat, or phone. Free of charge of course.
36"
You're going to want a 4-6 person round or square table depending on the size of your dining area. Possibly something like this http://www.furniturecreations.com/6_Seat_Dark_Wood_Kitchen_Dining_Room_Table_With_Leaf_CST101270.htm
9'0" Diameter
Assuming you are talking about a 60" diameter table and a regular octagon (regular being of equal sides) you would need a room that is 60" across. If you wanted chairs, add 30".
20" x 92"
There is no single size that a cafeteria table should be. It depends on the space available in the room and how many people there are to be fitted around the table.
It depends on what size round table you are looking at getting. They can usually fit anywhere from 2-6 comfortably.
10 feet
The table would have to be at east ten feet in diameter.