No, they may also be parallel.
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No. Two planes may be parallel and so may not intersect. Also, any line is the intersection of infinitely many planes, not just two.
Yes providing that they are not parallel
parallel planes
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.