Question

obtain the scalar product of the vectors (6,2,3) (2,-9,6) and also the angle between them​

Answer 1

Answer:

let

A = 6i + 2j + 3k = > l A l = 7 units

B = 2i - 9j + 6k = > l B l = 11 units

l A • B l = 6(2) + 2(-9) + 3(6)

= 12 units

cos x = l A • B l/ l A l l B l

cos x = 12/77

$x = { \cos }^{ - 1} (\frac{12}{77} )$