What does ∣ z ∣ = 4 represent on a plane where z = 4 represent on a plane where z = x + iy, a complex number?

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Chapter 4 of the NCERT Maths textbook for Class 11th focuses on Complex Numbers and Quadratic Equations. This chapter introduces the concept of complex numbers and explains their properties and operations. It covers topics such as the geometric representation of complex numbers, the modulus and argument of a complex number, and the polar form of complex numbers. The chapter also dives into quadratic equations and their solutions, including how to solve them using methods such as factoring, completing the square, and the quadratic formula. The chapter ends with a discussion on the nature of roots and discriminants.