This is a short lesson on understand the Dot Product Theory of Trig. I used my class notes to put this together, because I know that during my time in that class, something like this would have really helped me. Good luck! Email me with any ideas for more lessons at CinderellaMagic09@yahoo.com

1. Trigonometry The Dot Product LESSON ONE:

3. Examples U = <7, 5> V = <6, -8> U•V = <7•6 + 5•-8> U•V = <42+ 40> U•V = 82 U = <3, 2> V = <4, -3> U•V = <3•4 + 2•-3> U•V = <12 + -6> U•V = 6 Special Cases “Orthogonal”: Vectors intersect at a right angle; Dot product = 0. U = <5, 0> V = <0, -4> U•V = <5•0 + 0•-4> U•V = <0 + 0> U•V = 0 DP = 0 = 90°