As per your syllabus, eqn 3.15, the angle θ that a vector A makes with the x-axis (given components A_x and A_y) is which?
Acos⁻¹(A_x · A_y)
Btan⁻¹(A_x / A_y)
Ctan⁻¹(A_y / A_x)
Dsin⁻¹(A_y / A_x)
Answer & Solution
Correct answer: C. tan⁻¹(A_y / A_x)
syllabus eqn 3.15: tan θ = A_y / A_x ⇒ θ = arctan(A_y / A_x).
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