And now the other way round? Calculating the radius of a polygonal table
You can also calculate, how many people (with a given edge length) can sit at a table consisting of a certain surface. As a rule of thumb, you should allow for an edge length of 600 mm per adult person.
With the given length of the edge and the number of edges, the following formula applies:
R = K/2*sin(360°/(2*N))
Here is an example calculation:
You have an octagon (see above) and you want to have an edge length of 600 mm:
R = 600/2*sin(360°/(2*8))
R = 783.9377789258259 mm
R = 784 mm
You see, it's really easy! At first, again calculate everything below the horizontal line, and then divide the length of the edge by the result. Or simply use our online calculator in order to calculate the radius.