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Coordinates: plotting
Move points A, B and C into the green or red squares.

Please enable Java for an interactive construction (with Cinderella).
Where are the centres of each square?
Green square centre ( x coordinate, y coordinate):
Red square centre ( x coordinate, y coordinate):

a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
d1 d2 d3 d4
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