Vectors 7.4 Dot Product in R3
Channel: Ms Havrot's Canadian University Math Prerequisites
Date: 2020-02-20

Dot Product in R3 uses the same equation, just add in the z variable!
Finding the angle in a triangle in R3 requires you to position the vertex of the angle required at the origin first. You can also use the Dot Product to find a vector that is orthogonal to 2 vectors (but the cross product is an easier method).  Page 387 #17 is solved at the end of the video.