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    i hope this photo is clear.
    in the case of part B, what is the difference between BT=T' and TB = T'?
    and what does it mean for each one?

    When transforming vertices of a shape, represented by a matrix, say T, where the vertices are given in columns,you have to pre multiply T by the transformation matrix B to get the transformed shape.
    You could represent the vertices in a matrix where the vertices are given in rows not columns and in this case you would post multiply by the transformation matrix B.
    Hope this makes some sense.
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