Question

if A=ibar+jbar what is the angle between the vector and x-axis.​

Answer 1

If the angle between A and B are greater than 90 degrees, the dot product will be negative (less than zero), as cos(Θ) will be negative, and the vector lengths are always positive values. The required angle is 45°. Hence, the angle (θ) made by the vector with the x-axis is 45°. Hence, the angle (θ) made by the vector with the x-axis is 45°.