- Weighted sum of distances
- The point which minimizes weighted sum of distances to triangle's vertices
- Parallelogram area
- Fermat 2 ways
- incirclecontact
- Incircle Point of Contact
- Two ways of finding the Fermat Point
- Minimum Perimeter Inscribed Triangle
- Regiomontanus Problem
- Crank Slider
- gear related to belt
- Gear pair
- Paucellier's linkage
- Watt's Linkage
- Tchebychev's Straight Line Linkage
- A Median Theorem
- Four Bar Linkage
- Four Bar linkage with line
- four bar coupler curve
- A triangle from medians
- Coordinate Clock
- Abacus Corrected
- crank slider locus
- Maximum Area Triangle
- Projectile High Point
- September Problem