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Exploring addition of Complex Numbers

Drag points A and B around the complex plane. Point C is the sum of A and B. After you explore a bit, answer the following questions and be ready to share with the group. How should A and B be situated so that...
  1. C is on the Real axis?
  2. C is on the Imaginary axis?
  3. C is at the Origin?
The dynamic figure below shows complex addition from another point of view!
The dynamic figure below shows complex addition from another point of view!