Unit Vectors

Definition: A unit vector is a vector of length 1

Suppose a = (xa, ya) and b = (xb, yb). The vector shown here is set up so that (xb - xa)2 + (yb - ya)2 = 1, i.e. U has length one.

In the sketch, you can check it out by moving a to your favorite points and then see what you can choose for b; when you find a nice vector you can add its coordinates to the table by double-clicking on it.

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