5.2 Contents

1. Proof of $π$ 🔧

2. The Natural Number $e$ 🔧

3. The Golden Ratio $φ$ 🔧

4. The Plastic Ratio 🔧

5.2.1 Proof of $π$ 🔧

5.2.2 The Natural Number $e$ 🔧

5.2.3 The Golden Ratio $φ$ 🔧

5.2.4 The Plastic Ratio 🔧