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1x64, 2x32, 4x16 or 8x8.
8x8 4x16 2x32 1x64 and 25638659209861x4.0060405E11 apparently, all credit to online calculators.
Just four rectangles comprise 64 squares of the same size: 1X64, 2X32, 4X16, and 8X8.
8=23 12=22x3 20=22x5 28=22x7 18=2x32 27=33
Let W = width of garden. Therefore 4W = length of garden. Area is length x width, ie W x 4W = 256 sq ft. Rewrite as: 4W2 = 256 W2 = 256/4 = 64, therefore W = 8ft, and length = 32ft. So total length of fence required is (2x8) + (2x32) = 80 ft. Happy building!