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pi day, what is pi?, what is the number pi?, books on pi for kids, the golden rule and pi

Pi Day!

What is Pi?

Today is Pi day!

Get it?

3.14. March 14th. 3/14.

Yes, a math joke!

I wanted to celebrate Pi day by showing the relationship of math to the world around us including circles, pyramids and great works of art!

pi, pi day, pi phi and fibonacci numbers

p.s. I have a post on the math of spirals if you want more math in nature.

Pi is a name given to the ratio of the circumference of a circle to the diameter. That means, for any circle, you can divide the circumference (the distance around the circle) by the diameter and always get exactly the same number. It doesn’t matter how big or small the circle is, Pi remains the same. Pi is often written using the symbol  and is pronounced “pie”, just like the dessert. from


Another way to think of Pi. You can measure Pi by constructing a physical wheel and rolling it out. Read more…