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Yes, the intersection of 2 planes is a line.
No, planes intersect at a line.
An edge is the curve formed where two of the planes defining [bordering] the 3D shape meet. It is often a straight line where the planes defining the shape meet but, as in the case of a hemisphere, an edge could be a circular boundary where the flat face meets the curved face.
ONLY a line can be formed by the intersection of two planes...and always.
Yes, it is possible for three distinct planes to intersect at a line.