The Barbie Reuleaux Dream Car is a MathHappens project. It is named for Reuleaux triangles, which—like circles—have constant width, but which—unlike circles—do not have a constant radius.
Here you see the applied-mathematician Barbies, all buckled up and ready for a day of field work in their mathy car.
You can read more about the Reuleaux-triangular axle and wheel mechanism at Mathematical Études. You can read more about MathHappens and Reuleaux cars on the MathHappens website.
If you want to bring math fun to your school or community event, get in touch! cdanielson@mathhappens.org
Overthinking my teaching 