Question

find angle between A = I^ + j^ and B = I^ +K +4j^​

Answer 1

Explanation:

A⃗ =i−j|A⃗ |=1+1−−−−√=2–√

B⃗ =j+k|B⃗ |=1+1−−−−√=2–√

Letθbe the angle between two vectors

A⃗ ⋅B⃗ =|A⃗ ||B⃗ |cosθ

⟹1(0)+(−1)(1)+0(1)=2cosθ

⟹cosθ=−12

⟹θ=cos−1−12=120∘or240∘