Using Loci in the Argand Diagram to Find the Range of Arg(z)

Questions involving loci in the Argand Diagram are a 'not so common' complex number question type, but they do come up occasionally, and as such it is important to be able to deal with questions such as that posed in this video.

This question is great practice for higher 'A Level' equivalent exams such as JC2H2 Maths and Higher IB Maths, as well as useful revision for pre-university and first year university maths students.