Polar form of a complex number

A number written in the form https://www.w3.org/1998/Math/MathML"> Z = r ∠ θ https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429294402/7a019bd2-8e3e-42f5-a1b0-42593cc08f27/content/eq2395.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> is known as the polar form of a complex number.