Question

The angle between two vectors -2i+3j+k and i+2j-4k is A. 0 degree B. 90 degree C. 180 degree

Answer 1

Hope it help you. ...........

Answer 2

Let, a = 2i-3j+k and b = i+2j+4k

We know that, a.b=ab cos∅

So, cos∅= a.b/ab

a.b= 2–6+4= 0

So, cos∅= 0/ab

cos∅= 0

cos∅=cos90°

Hence, angle between the vectors a & b is 90° or π/2 radians

Hope it helps!!