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The intersection.
In Euclidean geometry, any two lines in a plane that are not parallel will cross.
Perpendicular lines are those that even if stretched to infinite lengths, they will NEVER touch. Intersecting lines are those that aren't necessarily 90 degres seperated, but ones that will, at one point, cross over.
crosshatching
To find the centre of a square or rectangular board, draw a diagonal line from corner to corner. Repeat for the remaining two corners. Both lines will cross over at the centre of the board.