exactly one
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It has 8. Each passes through the centre. Four pass through vertices, four pass through the mid-points of opposite sides
It has 8. Each passes through the centre. Four pass through vertices, four pass through the mid-points of opposite sides.
The lines that pass through points 4 -6 2 -3 and 6 5 3 3 on a grid are the lines y=x.
They are intersecting lines.
Nonee !