Click the green flag and watch a rolling Reuleaux triangle. Adjust the rolling speed if you like.
If you wonder what a Reuleaux triangle is, watch this project first: https://scratch.mit.edu/projects/532128864/ Thanks to @cardwellkatie91 for the idea: https://scratch.mit.edu/projects/529278910/#comments-207875810 References used: https://www.geogebra.org/m/ev8drqhq https://en.wikipedia.org/wiki/Reuleaux_triangle https://en.wikipedia.org/wiki/Equilateral_triangle