The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

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. Likewise, a sphere's volume is ...

Happy Pi Day to you and everyone around you! I always like to find something cool to do with pi on Pi Day. What if I just try to determine the value of pi without using pi (which seems obvious). How ...

March 14 is Pi Day for 3.14, an important concept that touches almost all aspects of math and science. Let’s dish up some fun with all things pi. In math, pi is what’s known as an irrational number — ...

June 28. National Paul Bunyan Day, National Insurance Awareness Day, National … Tau Day? Today (June 28) is the unofficial holiday Tau Day, meant to celebrate the number tau, that works out to ...