Any two lines that meet must be in a plane. The plane may not necessarily be horizontal or vertical such as X-Y or X-Z or Y-Z
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Perpendicular lines have to intersect to make a right angle Like this: + Intersecting lines don't have to intersect to make a right angle Like this: X
perpendicular
Yes they intersect at 90 degrees
If the two lines are parallel, they will never connect. A straight line drawn across those lines will intersect them at identical angles. If you have perpendicular lines, they intersect and all four angles that they make are 90 degrees.
A closed, plain figure bounded by three or more line segments. These lines cannot be curved and they cannot intersect. A polygon must also fall on a single plane.