Tangent.
it depends on how you place it, they can be. all a line segment is is a straight line, if you have two you can have parallel or crossing lines.
An intersection
Perpendicular lines.
intersecting lines...
In two dimensions the lines would be intersecting lines not perpendicular (I believe this is called transversal, see related link). If you are in three dimensions they would be skew lines, like to jets crossing above you that don't hit each other. One is higher than the other.
Two straight lines that are equidistance from each other.
two lines crossing each other
If the shape has three straight lines and no other lines then it has to be a triangle
Parallel lines are 2 long straight lines that don't touch each other
they both have lines crossing each other which make angles. perpendicular lines make right angles while intersecting lines make other kinds
Perpendicular Lines are two straight lines that intersect to form a 90 degrees or an right angle.Regards,