Question

The angle between Vector A = (î +j) and Vector B = (î -j)

a. 45°
b. 90°
C. 60°
d. 180°​

Answer 1

Answer:

answer will be 90 degree

Explanation:

you must know-A.B=|A||B|cos theta

A.B=(i+j).(i-j)

=1-1=0

|A|=sqrt(1^2+1^2)

=sqrt.(2)

|B|=sqrt(1^2+1^2)=sqrt.(2)

A.B=|A||B|COS THETA

cos theta=0/(sqrt.(2).(sqrt 2)

cos theta =0

theta= cos^-1(0)

theta=90 degree