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Coordinates: plotting
Move point A to (-6,-1) and B to (8,5).
Please enable Java for an interactive construction (with Cinderella).
Where is the middle of the line joining A to B?
(1, -1) (1, 2) (2, 1) (1, 1)

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