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 :)
An example of a famous parallelism is "It was the best of times, it was the worst of times."
parallel lines never intersect.
Coplanar lines can intersect an infinite amount of times.
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.
Two straight lines can cross either once or never.
It depends on how many lines intersect. An infinite amount.
It depends on how many lines intersect. An infinite amount.
Two.
4
1
If it's a line it would only be 1, but if it's a parabola, or something with a curve, it could be multiple times.
Draw a straight line segment. From one of its ends, draw another straight line segment. From the end of this straight line, draw another straight line segment which does not touch any of the existing lines. Repeat the same 5 more times. From the end of this last line, draw a straight line to the start of the first line. You may need to tweak some of the intermediate lines so that the last line does not intersect an existing line. That is it! A plane area enclosed by 9 straight lines = a 9-sided polygon.