BETA
Chapter 1
The math of the middle
Chapter 2
Sizing up the cosmos
Chapter 3
Engineering the everyday
YOUR GOAL
Master of The story of diameter
Ch 1 · The math of the middle
sonia Play Pi in the Middle, an exciting educational math game. Master circle geometry and pi concepts while having fun. Play online for free now!
hue The Reuleaux Heptagon
My diameter's a constant as I roll across the floor, So I slip right through the slot of the vending machine door
sonia Discover the universal ratio shared by all circles in our universe, from coins to planets. Explore this stunning infographic to learn the secrets of Pi.
hue Dividing any circle's outer perimeter by its diameter always yields the magical mathematical constant known as pi.
Fun Fact
Circle's big line: The word diameter comes from the Greek 'diametros,' which translates to 'measuring through' a shape.
Glossary
radius (noun)
A straight line from the center to the circumference of a circle or sphere. In 1570, John Dee translated Euclid's work, defining this line as half of the circle's diameter.
A straight line from the center to the circumference of a circle or sphere. In 1570, John Dee translated Euclid's work, defining this line as half of the circle's diameter.
sonia Explore the magic of Pi! This educational infographic reveals the hidden constant ratio shared by every single circle in the universe.
hue Cutting a circle's diameter exactly in half gives you the radius, the foundational measurement for drawing perfect curves.