- Cosine Rule
- Cosine Rule
- Function Composition
- Pipeline Problem
- Ellipse Isotomic
- Incircle Radius
- Mechanical Location of the Fermat Toricelli Point
- Stationary Trebuchet
- Wheeled Trebuchet
- Simple Chaos Machine
- Pendulums
- Least Squares Regression
- Minimum Perimeter Triangle
- Maximum Perimeter Triangle
- Maximum Area Triangle
- Maximum Sum of Squares
- Maximum Sum of Squares
- Pattern drawing toy
- 5 bar toy variable radius
- Symmedian Point
- Double Pendulum
- Cevians
- A Three Body Problem
- A lemma of Archimedes
- Beat the Brachistochrone
- Cycloid is the Brachistochrone
- Tautochrone
- Two Pendulums
- Tautochrone pendulum
- Inverted Pendulum
- Convex Concave
- Catastrophe