Convert from rectangular to polar coordinates: note: choose rr and θθ such that rr is nonnegative and 0≤θ<2π0≤θ<2π (a)(9,0)⇒(r,θ)(a)(9,0)⇒(r,θ)( 9 equation editorequation editor , tan(0) equation editorequation editor ) (b)(18,183√)⇒(r,θ)(b)(18,183)⇒(r,θ) ( 20.7846 equation editorequation editor , tan(18/sqrt(3)/18) equation editorequation editor ) (c)(−5,5)⇒(r,θ)(c)(−5,5)⇒(r,θ)( 10 equation editorequation editor , equation editorequation editor ) (d)(−1,3‾√)⇒(r,θ)(d)(−1,3)⇒(r,θ)( 4 equation editorequation editor ,