Whats the circumcenter of δefg with e(2,6) ,f(2,4) and g(6,4)

You need to find the distance between the 3 lengths of the lines from the given points
ef =  sqrt ( 6-4) ^2 + 2-2^2) = sqrt 4 = 2
fg =  sqrt (6 - 2)^2  + 4-4^2  =  sqrt16 = 4
ge = sqrt (6-4)^2 + (2-6)^2) = sqrt 20 =  4.47
circumference = 2 + 4 + 4.47 = 10.47 

How many people are we starting with? i will answer it's just i need to divide 8 by the total amount of people to get how many tables

Ithink it would be 1.24 pounds