Our natural inclination, when in a group, is to gather in a circle. The ineluctable power and unity of this shape gives each person equal standing, an equal voice and equal support. The result? A unified purpose or intention arising from talking and listening, in turn.
A circle is a pefect shape for expressing ourselves to others. Like theater in the round, no one has a better seat than anyone else. No wonder circular gathering spaces are becoming increasingly popular in group activities and in various spiritual traditions.
This is why I advocate Circular Peace Gardens wherever people may gather. A circle is a nurturing form that invites us in - there are no hard edges, corners or angles.
Always start with determining the personal space required for each person which is about a 4'0" radius around each person...then I add another 1 ft. for move around space. I then use this as the space - 5 ft. - as the rough distance between people. This is my approach and you may use your own.
So if you want 10 people in your circle then multiply 5'0" x 10 to get a circumference (perimeter) of about 50 ft. Once you know that you can go here (click on it) for help to determine that your circle's diameter should be about 16 ft.
The radius would therefore be about 8 feet. If you wanted 20 people, then double this to get a diameter of 32 ft. or a radius of 16 ft. This is the minimum! You can always go bigger.
Always work from the center point out when laying out the circle...Here is a wonderful diagram from a mathematics in gardening blog: