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: The text uses precise, "clean" diagrams. The authors argue that a neat diagram is often the key to solving a problem, with some proofs designed to be understood almost entirely from the visual representation. Why It Is Highly Regarded

Use a compass and straightedge. A clean diagram often reveals the solution.

The book isn't just a list of problems; it’s a structured journey from geometric intuition to high-level mastery. Theoretical Foundation:

You cannot solve this without setting up a homothety or an inversion centered at a tangency point.