So you have a circle. What is the area of that circle? Surely everyone remembers that the area of a circle is: Where Pi (π ... the area density (mass per unit area) for the paper is fairly ...

The angle at the tip of the sliced pizza would be pi/4 and not pi/8. Using ... of a circle relative to radius 1 instead of diameter 1, and it makes some formulas and the unit circle look a lot ...

Saturday is 3-14-15, the first five digits of the mathematical constant pi: 3.141592653. The next time that happens is in March 2115.

Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math teachers love to dream up unique classroom activities to celebrate Pi for it endless opportunity to calculate (3 ...

Exploratorium attendees show children how Pi is the ratio of a circle's circumference to its diameter during Pi Day in San Francisco, Thursday, March 14, 2013. (Exploratorium) ...