2 vectors. 1st one is 6 meters. The other one has is 4 meters. By adding them together I want a module of 3 meters. What should the angle between those modules be? The answer is 153 degrees but I have no idea how to get to that answer. Thank you!

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Answer 1 · 2018-02-12T10:14:54

#"please look at the fallowing details."#

enter image source here

#"You can solve it using Cosine's theorem."#

#3^2=6^2+4^2+2*6*4*cos theta#

#9=36+16+48*cos theta#

#9=52+48*cos theta#

#9-52=48*cos theta#

#-43=48*cos theta#

#cos theta=-43/48#

#theta=153.62" " deg#

enter image source here