Problem
First name
Ryan Thomason - Jones and Alisha hawkins
School
Lacon Childe
Country
Age
12
Filename
First take the rectangle numbers and add them up together then divide them by 2 which gives you the centre number. Then take the circle you want to find out,take the opposite rectangle number and take it away from the center number. do this for all the circles. Alisha found this out by trying lots of examples and accidentally discovering the centre number.
we can prove this with algebra.This is how:
d+e+f divided by 2 = g (center number)
g-e = b
g-d = c
g-f = a
a + c = e
b + c = f
a + b = d