Circumference Phone Cases - iPhone and Android

Description: Medieval geometry for math nerds to history teachers (and everyone in between!)

Description: A black background displays white text listing mathematical formulas and their descriptions. It starts with the Pythagorean Theorem (a² + b² = c²), followed by the Area of a Circle (Area = πr²), and the Circumference of a Circle (C = 2πr). It concludes with 'AND FINALLY... THE BIG ONE' and the equation for a line (y = mx + b) described as '(A FREAKIN' LINE)'.

Description: Rendered on a deep dark background, this artwork presents a circle with its diameter of 20,000 and circumference of 62,832, ringed by petals, above Aryabhata's approximation π ≈ 62,832 / 20,000 = 3.1416. In his Aryabhatiya of 499 AD, the Indian mathematician and astronomer Aryabhata gave the value of pi as 62,832 divided by 20,000, or 3.1416, an exceptional precision for his time. Made for math teachers, mathematicians and students who love an elegant proof, it brings classic mathematics to a classroom, study or home office.

Description: Too Much Pi Can Give Large Circumference Funny Pi Day Math

Description: A skull wearing a chef's hat, with crossed bones behind it, inside a circular border. The text 'KNUCKLE SANDWICH' curves along the bottom. The design uses a distressed, vintage style in white and black only.

Description: Another Pi Day! Twenty Second of July, Pi Approximation Day, 22 divided by 7 equals approximately 3.14. Fascinating smart people for a long time. Good choice for anybody with interest in mathematics, sciences, engineering, history, etc. Colorful version.

Description: Funny Come to the Math Side we have PI

Description: Another Pi Approximation Day design. Another Pi Day! Twenty Second of July, Pi Approximation Day, 22 divided by 7 equals approximately 3.14. Fascinating smart people for a long time. Good choice for anybody with interest in mathematics, sciences, engineering, history, etc.

Description: Pi sign drawing. Fascinating smart people for a long time. Good choice for anybody with interest in mathematics, sciences, engineering, history, etc.

Description: Pi symbol and spiral numbers. Good choice for geeks and anybody with interest in mathematics, sciences, engineering, history, etc. Fascinating smart people for a long time. Celebrate Pi Day, March, 14!

Description: Tau Day mathematical constant t-shirt design.

Description: Buzz into math fun with our adorable bee teaching maths! Celebrate Pi Day with a playful twist as our busy bee helps you explore the wonders of circles, pi numbers, and more in this delightful design.

Description: This design if all typography including the symbol for pi.

Description: Bold Y2K style Human being design. The numbers are the circumference of earth symbolising all of us. We are all human beings.