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englargment by scale factor k about the origin
K 0
0 K
rotation 90 clockwise about origin
0 1
-1 0
rotation 90 anticlockwise about origin
0 -1
1 0
rotation 180 about origin
-1 0
0 -1
reflection in y=0
1 0 0 -1
reflection in x=0
-1 0
0 1
reflection in y=x
0 1 1 0
reflection in y=-x
0 -1
-1 0