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Posted by **matematicass** on Tuesday, June 5, 2012 at 5:19pm.

Gracias por ayudarme

- math -
**Steve**, Tuesday, June 5, 2012 at 5:33pmu.v = |u| * |v| * cosθ

cosθ = (6+8)/(2√2)(5) = 14/10√2

θ = 8.13°

- math -
**Count Iblis**, Tuesday, June 5, 2012 at 5:34pmu dot v = |u| |v| cos(theta)

u dot v = 6

|u| = 2 sqrt(2)

|v| = 5

cos(theta) = 3/[5 sqrt(2)]

- math -
**Count Iblis**, Tuesday, June 5, 2012 at 5:36pmCorrection u dot v = 8, so

cos(theta) = 4/[5 sqrt(2)]

- math -
**matematicas**, Tuesday, June 5, 2012 at 6:47pmbut isn't is a three dimensional vectors

- math -
**Steve**, Wednesday, June 6, 2012 at 12:40pmmy bad. I misread the problem.

Count Iblis is correct.

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