Defining i^2

This example demonstrates the geometric and algebraic meaning of the square of the imaginary unit i being equal to -1. It involves core mathematical concepts such as complex numbers, the imaginary unit, coordinate systems, and geometric representation. The construction uses GeoGebra commands and objects like Textfield, objects k, a, b, A, B, pic1, text2, text3, text1, InputBox1, t, r, c, text5, text4, text6, text7, text8, text9 for visualization and interaction. Suitable for high school mathematics students with a basic understanding of complex numbers to deepen their comprehension of fundamental properties of complex numbers.