Question

Can someone please EXPLAIN this to me, I really need a explanation not just a answer.

Answer 1

First line:

XV, XT, VT

Second line:

YV, YU, VU

Notice:

`\overrightarrow{VT}` it is a vector

`\overline{VT}` it is a segment

`V, T` they are points

`\overleftrightarrow{VT}` it is a line