anonymous
  • anonymous
Two vector A=(3, 4, -5) and B=(-1, 1, 2). Determine the magnitude of A+B and the direction (angle) of A+B ?
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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misty1212
  • misty1212
HI!!
misty1212
  • misty1212
did you find \(A+B\)?
anonymous
  • anonymous
Yes, it is \[\sqrt{38}\] and the angle I found is 121 but the answer it the book says it is 71 =(

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misty1212
  • misty1212
oh how did you find the angle (i actually am not sure what angle means in three dimensions)
anonymous
  • anonymous
A.B( dot product) = \[\left| A \right|.\left| B \right|\] .cos
misty1212
  • misty1212
doesn't that find the angle between the two vectors?
anonymous
  • anonymous
Yes, think the book has the wrong answer! thank you anyway ^^

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