This computer science video is the second in a series about linear algebra for computer scientists. In this video you will learn how to calculate the magnitude of a geometric vector. You will see that to calculate the magnitude of a vector, in two or three dimensions, you must find the length of the hypotenuse of a right angle triangle using Pythagoras’ theorem. You will also see how the magnitude of a vector with any number of dimensions can be easily calculated. The term unit vector, that is a vector with a magnitude of one, is also defined. Chapters: 00:00 Magnitude of a vector? 00:18 Pythagoras’ Theorem 01:00 Magnitude of a 2 Dimensional Vector 01:30 Unit Vectors 02:05 Magnitude of a 3 Dimensional Vector 03:20 Magnitude of a vector with any number of dimensions