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Hier
If you consider a vector has a distance and a direction, the direcrion can be expressed by an X distance and a Y distance, and the hypotenuse of the triangle formed is the vector distance.A unit vector has the triangle hypotenuse reduced to one unit with the X and Y distances modified accordingly.This may help :https://www.khanacademy.org/math/precalculus/vectors-precalc/unit-vectors/v/unit-vector-intro
I can't understand No.3. what is unit vector?
... my math is so bad.
Yep ... a party hat.