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No, planes intersect at a line.
They intersect at a point
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.
Never.
In 3d space, two planes will always intersect at a line...unless of course they are the same plane (they coincide). Because planes are infinite in both directions, there is no end point (as in a ray or segment). So, your answer is neither, planes intersect at a line.