Assuming that this refers to a line which has been cut into 2 parts, the parts would be called segments.
Overlapping portions of two continents are known as continental plates or tectonic plates. These plates can collide, separate, or slide past each other due to the movement of the Earth's tectonic plates.
A line of interception.
parrallel
No, it is called an intercept.
well yes because if you were to split it in half downwards perfectly through the line then you'd have two matching portions
transversal
Chord
vertex
Bisector
Apex:true
A line of symmetry
A border