Question
Fri February 20, 2009 By:

if a,b,c are three non parallel unit vectore, such that a x (b x c)=1/2b ,find the angles

Expert Reply
Fri February 20, 2009

as we know A  B = ab cos θ  where a and b is magnitude

so for above eqn we have  abc cos θ = b /2 as a,b,c are unit vectors so we have  cos θ = 1/ 2 ==> θ = 60

Home Work Help