Pythagrean theorem a²+b²=c² using the width (6m) as 'a' and the length (7m) as 'b', you can calculate the length down the middle, c 6²+7²=c² 36+48=c² 85=c the to get rid of the square on 'c', you find the square root of everything √85=c 9.22=c the length of fence used for dividing the garden will be 9.22m