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In Euclidean planar geometry, not unless they're collinear, in which case they intersect an infinite number of times. In other types of geometry ... maybe.
It depends on how many lines intersect. An infinite amount.
50. It is always two times the rotation.
I thought it was never. like this l l, two lines next to each other, but never getting closer and thus never crossing.
First you draw a big multiplication sign, and then you draw another line vertical to the right of the sign (so it intercects both lines), and then you draw the final line horizontally above the sign (so it intercects all three lines), and you have 6 points of intercection :)