It is the distance between its endpoints and there are 180 degrees on a straight line
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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.
Sum of adjacent angles on a straight line.
Displacement of a straight line is zero...
A straight line has no vertex.
There are 180 degrees on a straight line.