Posted by **TAYLOR** on Thursday, May 17, 2012 at 4:53pm.

find the angle between vectors U= <2,3> and V= <1, -5>

- trig -
**Damon**, Thursday, May 17, 2012 at 6:04pm
cos T = U dot V / ( |U|* |V| )

= (2-15) / (sqrt 13 + sqrt 26)

= -13 / (sqrt 13 + sqrt 2 sqrt 13)

= -13/ [sqrt 13 (1 + sqrt 2) ]

- trig -
**TAYLOR**, Thursday, May 17, 2012 at 6:10pm
would that be 88 degrees, 45 degrees, 135 degrees, or 92 degrees?

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