trig
posted by
TAYLOR on
.
find the angle between vectors U= <2,3> and V= <1, 5>

trig 
Damon,
cos T = U dot V / ( U* V )
= (215) / (sqrt 13 + sqrt 26)
= 13 / (sqrt 13 + sqrt 2 sqrt 13)
= 13/ [sqrt 13 (1 + sqrt 2) ]

trig 
TAYLOR,
would that be 88 degrees, 45 degrees, 135 degrees, or 92 degrees?