Given the vector → u = ⟨ 5 , − 6 ⟩ , find the magnitude and angle in which the vector points (measured counterclockwise from the positive x-axis, 0 ≤ θ < 2 π )

Question

This question still stumps me because I still don't know how to get the answer in my calculator.

Answer 1

|| u || = √(5² + (-6)²)

tan θ = -6 / 5