• Area Builder from PhET illustrates the relationship between perimeter and area

https://phet.colorado.edu/sims/html/area-builder/latest/area-builder_en.html

 

Two useful simulations from JavaLab

• Hypocycloid https://javalab.org/en/hypocycloid_en/
• Epicycloid https://javalab.org/en/epicycloid_en/

 

• Hyperpaint allows you to illustrate drawing on a hyperbolic surface

https://editor.p5js.org/zokalyx/full/ESz3r4_Tu