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 rectangles are there in a square grid?
Since a square also fits the definition of a rectangle, these need to be included.
For a 2x2 grid there are four 1x1 squares, four 2x1 rectangles and one 2x2 square; a total of 9 rectangles.
For a 3x3 grid there are nine 1x1 squares, twelve 1x2 rectangles, four 2x2 squares, six 1x3 rectangles, four 2x3 rectangles and one 4x4 square; a total of 36.
The general form for the number of rectangles in a mxm grid is N=[m(m+1)/2]2
If the number of rectangles in a grid 5x5 is given by abc the cache can be found at:
N51 13.(a+a+b)(a/b)a E000 10.(a+b+c)(a+a+b)(a+b+c)
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