Vector Length

Given a vector V with tail at the origin and head at b = (xb, yb), what's its length?

According to Pythagoras, the length of the hypoteneuse is the square root of xb2 + yb2.

You can move b around and calculate the length of a few favored vectors. But suppose you come across a vector whose tail is not so nicely situated?

Apply Pythagoras again.

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