I'm not seeing any indication of three numbers relating to length. I see a gap in information, not a leap from "3 numbers" to "length." What's missing is the d

I'm not seeing any indication of three numbers relating to length. I see a gap in information, not a leap from "3 numbers" to "length." What's missing is the definition of a vector: an item with direction and magnitude/length. Using the distance formula, you can determine the length of the vector. So if your vector is <5,4,3>, plug that and the origin <0,0,0> into the distance formula to get a length of 5 * sqrt(2) (approximately 7.071) Further, you can 'normalize' the vector so that the direction is the same but the magnitude is 1. To normalize, divide each component by the length: http://www.wolframalpha.com/input/?i=%3C5%2F(5sqrt(2))%2C4%2F(5sqrt(2))%2C3%2F(5sqrt(2))%3E http://www.wolframalpha.com/input/?i=%3C5%2F(5sqrt(2))%2C4%2...