Contextualization
Complex numbers are a fascinating area of mathematics that introduces a whole new dimension to our understanding of numbers. They consist of a real part and an imaginary part, which are combined using the imaginary unit i (where i is defined as the square root of 1).
The Modulus of a complex number is its distance from the origin in the complex plane. It is also referred to as the magnitude or absolute value of a complex number. The modulus of a complex number a + bi is denoted as a + bi and it is calculated as the square root of the sum of the squares of the real and imaginary parts, √(a² + b²).
The concept of Modulus is not only a crucial part of understanding complex numbers, but it also has numerous applications in various fields including physics, engineering, and computer science. It is used in signal processing, control systems, quantum mechanics, and more.
Modulus helps us understand the magnitude of a complex number in relation to the origin. It provides a way to determine the distance between two complex numbers in the complex plane. This distance is not just a straightline distance, but it also takes into account the curvature of the complex plane.
Understanding the Modulus of a complex number is not just a theoretical exercise, but it is also a practical skill that is used in many realworld applications. For example, in signal processing, the Modulus is used to determine the magnitude of a signal, which can be important in applications such as audio processing or image processing.
Resources
To learn more about complex numbers and their Modulus, you can refer to the following resources:
 Khan Academy: The modulus of a complex number
 Brilliant: The Modulus of a Complex Number
 Book: "A First Course in Complex Analysis with Applications" by Dennis G. Zill, Patrick D. Shanahan.
 YouTube: Complex Numbers  Modulus by MathTheBeautiful
These resources will provide you with a solid foundation in the understanding of complex numbers and their Modulus. Happy learning!
Practical Activity
Activity Title: Exploring the Modulus of Complex Numbers
Objective of the Project:
To understand the concept of Modulus and its application in the complex plane through a handson and visual exploration.
Detailed Description of the Project:
This project will involve the creation of a visual representation of the Modulus of complex numbers on a complex plane. Students will work in groups of 3 to 5 to prepare a poster or a digital presentation that explains the concept of Modulus, its calculation, and its application in the complex plane.
Necessary Materials:
 Paper and colors (for creating a physical poster)
 A computer with internet connection (for creating a digital presentation)
 Ruler and protractor (for drawing the complex plane on the poster)
 Calculator (for calculating the Modulus of complex numbers)
 Access to software like Microsoft PowerPoint or Google Slides (for creating the digital presentation)
Detailed StepbyStep for Carrying Out the Activity:

Research and Understanding (1 hour): The first step is for each group to gather information about the Modulus of complex numbers using the provided resources. Discuss the concept within your group and ensure everyone understands the theory behind it.

Plan your Project (30 minutes): After understanding the theory, plan how you will present the information. Brainstorm ideas for visual representations and decide how to carry them out.

Create the Complex Plane (30 minutes): Draw the complex plane on the poster or in the digital presentation. Ensure it is accurate and properly labeled.

Plotting Complex Numbers (1 hour): Now, choose some complex numbers and plot them on the complex plane. Remember, the horizontal axis represents the real part and the vertical axis represents the imaginary part.

Calculating and Representing Modulus (1 hour): Calculate the Modulus of each of the complex numbers you plotted. Represent these Modulus values using different colors, shapes, or sizes for the plotted points. This will help visualize the Modulus concept.

Discussion and Conclusion (1 hour): Discuss the patterns you see in the plotted complex numbers and their Modulus. Use your findings to explain how the Modulus is related to the distance of a complex number from the origin.

Prepare the Report (1 hour): Finally, each group will write a report based on their findings and the process they followed. The report should include Introduction, Development, Conclusions, and Used Bibliography.

Introduction: Explain the concept of Modulus, its relevance, and realworld applications. Also, explain the objective of this project.

Development: Detail the theory of Modulus, explain the activity in detail, the methodology used, and present and discuss the results.

Conclusion: Revisit the main points of the project, state the learnings obtained, and the conclusions drawn about the project.

Bibliography: Indicate the sources you used to work on the project such as books, web pages, videos, etc.

Project Deliverables:
 A poster or digital presentation showing the complex plane with plotted complex numbers and their Modulus.
 A written report detailing the theoretical understanding of the Modulus, the process of the project, and the conclusions drawn.
The total duration of the project is expected to be about 68 hours per student, including research, project work, and report writing. Remember, the aim of this project is not only to understand the Modulus of complex numbers but also to develop teamwork, problemsolving, and time management skills. Good luck, mathematicians!