To celebrate 14th March (π day), MathsCity in Leeds is hosting a competition to celebrate everyone’s favourite geometrical shape whose circumference is π times its diameter: the circle.

## You're reading: Posts Tagged: circle

### The Mathematics of Spirograph

If you’re the kind of person who’s interested in doodling and/or fun toys, you might have encountered the fun doodling toy Spirograph, or some unbranded equivalent. It sits somewhere on the continuum between an artistic drawing tool and a neat mathematical gadget.

### Many-to-many Shape Sorter

Did you like playing with shape sorters as a toddler, but find them too simple as an adult? Well, I’ve got good news for you.