Reuleaux Triangle Constant Width Math Toy

A real thing, made fresh for you when you order.

11k downloads in the maker community

$9.99

Color: Gray

Printed in the USA when you order.

1.You order it
2.We print it fresh
3.It ships to you

Rolls smoothly under a flat board, just like a circle
A hands-on demo of constant width geometry
Sparks great math conversations with kids and students
Sits on a desk as a quiet conversation piece
Fun for STEM teachers, students, and math lovers

You set a book on top of three of these and roll it across the desk. The book glides like it sits on round wheels, even though the shapes are not circles. That is the magic of constant width.

The Reuleaux triangle is one of the classic shapes of geometry, and this volume of revolution version turns the lesson into a hands-on toy. Drop it on a desk, roll it under a notebook, or pass it around a classroom.

Use it as a math teacher's prop, a STEM gift, or a quiet desk piece that earns more questions than most office decor does.