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Rotation Of "T"-Shapes Clockwise I shaded "T"-shapes on all the girds from 5 by 5 to 10 by 10, so that I could make a sequence and then find the formulae for all the grids. I rotated the "T"-shapes 90? clockwise until I had made a full rotation, (refer to diagram 1A) but did not change the "T"-number as I rotated the "T"-shapes. I then drew tables to show the "T"-numbers and the "T"-totals for the grids. Once I had drawn the tables and calculated the "T"-totals for all the grids I realised that there is a difference of 7 between the differences of "T"-totals as the grid size increases by one. E.g. In the 5 by 5 grid there is a difference of 42 between the "T"-totals of the "T"-totals of the first rotation and in the 6 by 6 grid there is a difference of 49 between the "T"-totals...

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