Question

What is the angle between a=i+j and b=i-j

Answer 1

cos x = {a(bar) . b(bar)} / ab
cos x = {1-1}/ab
cos x = 0
x = 90 degrees

Answer 2

Answer:

The angle between a=i+j and b=i-j is 90 degree

Explanation:

Step 1:

Given Data:

The two vectors, a = i + j and b = i - j

Step 2:

To calculate the angle between them, to draw the vector diagram of both the two vectors.

Step 3:

cos θ = [(i+j).(i-j)]/ (magnitude of i+j).(magnitude of i-j)  

cost θ =0

θ = 90

Therefore the angle between a=i+j and b=i-j is 90 degree