yes, three planes can intersect in one point.
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No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
Two planes intersect at a line
The axes of coordinate planes intersect at the point of origin.
No. Any pair of the three will describe a plane, so the three possible pairs describe three planes.
In three-dimensional space, two planes can either:* not intersect at all, * intersect in a line, * or they can be the same plane; in this case, the intersection is an entire plane.