Please see number 1 in the series (Are you a square?) for a full description of the walk, there is street parking available in the village of Weald.
The cache is not at the posted coordinates.
This is a relatively simple puzzle, the information below will help you to solve it and might assist with a slightly harder one placed close by.
How many squares are there in a rectangular grid?
For a grid with the same number of horizontal and vertical squares (mxm) the total number of squares N can be found using the equation N = m(m+1)(2m+1)/6
But what happens when the grid is rectangular?
Consider three rectangles with grids of 1x4, 2x4 and 3x4 squares.
For a 1x4 grid the total number of 1x1 squares is 4.
For a 2x4 grid there are eight 1x1 squares and three 2x2 squares; 11 in total.
For a 3x4 grid there are twelve 1x1 squares, six 2x2 squares and two 3x3 squares; 20 in total.
The general form of the total number of squares N for a mxn grid (m<n) is N=((m(m+1)(3n-m+1)/6
If the number of squares in a grid 9x11 is given by abc the cache can be found at:
N51 13.(a+a)b(a+c) E000 11.(a-a)c(a+c)
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