These are forces which act in the same plane (coplanar, not coplanner!) and that their lines of action all meet at a single point.
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The answer depends on whether you mean A intersecting (B union C) or (A intersecting B) union C.
"cutting across"
If it is on a graph, intersecting means two or more lines go through the same point.
This means that the angle of intersection is not 90o.
It's when two lines cross eachother