Question

The angle between A=î + j and B = î-j is
a) 45°
b) -45°
c) 90°
d) 180°
​

Answer 1

APPLY DOT PRODUCT:

A=î + j

B = î-j

A.B = 0

THEREFORE

ABcos theta = 0

THEREFORE theta= 90 degree

HOPE IT HELPS❤