Question

The non zero vectors a b and c are related by a=8b and c=-7b then find the angle between a and c

Answer 1

Answer:

π

Step-by-step explanation:

let ¶ be the angle between a and C.

then a(vector) . c(vector) = |a||c|cos¶

therefore cos¶= a. c/|a||c|

cos¶= 8b.-7b/|a||c|

cos¶= -56|b|²/|8||-7|

cos¶= -56/56

cos¶=-1

cos¶=cosπ

¶=π