[Math 22] Disc 18 Intro to R3, distance formula, planes and spheres (Part 2 of 2)

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Discussion 18
Introduction to the 3-Dimensional Coordinate System, Distance Formula, Planes and Spheres
Part 2 of 2
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I think there's a small mistake at 11:51
r should've been √(10); (4-1) wasn't squared under the square root operator.

marcocuadra