Generally called an axis. Can also be pole.
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Angles are measured by degrees. A complete rotation (which brings you back to the place you started from) is 360o. A straight line is equivalent to an angle of 180o(or half of a complete rotation). A right angle, such as you find in the interior corner of a square, is 90o.
A straight line has no vertex.
Displacement of a straight line is zero...
There are 180 degrees on a straight line.
Ah, measuring a straight line is quite simple, my friend. You see, the measure of a straight line is its length from one end to the other. Just take a ruler or a measuring tape, place it at one end of the line, and extend it all the way to the other end. That's the measure of your straight line, and it's as beautiful as a happy little tree.