Philipp Legner

In [Polygons and Polyhedra](https://mathigon.org/course/polygons-and-polyhedra#quadrilaterals-area), users are asked to draw rectangles with the same size as given parallelograms or trapeziums. The area check works correctly, but we should shift user's rectangles...

This interactive diagram shows how the angle between consecutive leaves in a plant is always constant. We should add a rotating arc that visualises this: https://mathigon.org/course/sequences/fibonacci#sunflower-growing

We shouldn't rescale the y-axis in these coordinate systems, so that students get a better idea of how the variable parameters affect the growth of the sequence: https://mathigon.org/course/sequences/arithmetic-geometric#arithmetic-geometric-graph

For many of the sequences, e.g. https://mathigon.org/course/sequences/fibonacci#rabbits-3 it would be cool to ad an interactive "recurrence relation slider", as described here: http://www.antonellaperucca.net/perucca-recurrence.pdf

See https://mathigon.org/course/triangles-and-trigonometry#isosceles

See https://mathigon.org/course/triangles-and-trigonometry#contruction

See https://mathigon.org/course/graphs-and-networks#salesman * Hamiltonian cycle diagrams * Travelling Salesman Map Diagram * Greedy and 2-opt algorithm animation * Ant colony animation

Allow students to make their own graphs, and try to draw them with a single stroke

* Better interactive rotations * Momentum and damping * Automatic rotations on Firefox and Safari

Cool video: https://www.youtube.com/watch?v=8NmHZEKkkpM