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 ...

How to Solve for Radius in Excel. The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference.

Pi is the ratio of the circumference of a circle to its diameter. It’s an important foundation of mathematics, most importantly in geometry, physics and engineering.