Question

Vectors A and B are equal and A+B=A, then what is the angle between them?

Answer 1

Answer:

Angle is 120°.

Explanation:

By using Pythagoras Theorem

R= √(A^2 + B^2 + 2ABcos@)

Since A=B=R therefore

A= √(A^2 + A^2 + 2AAcos@)