Trigonometry problem

Question

Consider an angle with an initial ray pointing in the 3-o'clock direction that measures θ radians (where 0≤θ<2π). The terminal point is (1.12,−2.12)

What is the angle's measure in radians?

Answer 1

The angle is the inverse tangent of (y/x) (+180 degrees or π radians if x<0 )

θ = tan^-1(y/x) (Calculator will give you a negative angle)