you have to tell if the arms are pointing up or down on a function
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How far from end to end
It has one endpoint and the other end continues on.
in terms of pi- when using the symbol for pi instead of 3.14 or 22/7 in the end result of an equation
A ray looks like this: •----------------> One end point, and an endless line going the other way.
um I don't know,but it really isn't that important if you think about it you might not end up using this in everyday life understand?