The PI function is a Math & Trigonometry Function. Learn how to use the PI function in Excel, or how to multiply by PI, using this tutorial.

Today marks the 34th annual Pi Day. Researchers at NASA frequently use pi in their calculations while exploring the universe. Test your mathematical mettle with these Pi Day worksheets from NASA.

Pi Day, celebrated every year on March 14, is an excellent opportunity to teach kids that math can be more than just a confusing homework assignment.

Pi Day, celebrated every year on March 14, is an excellent opportunity to teach kids that math can be more than just a confusing homework assignment.

One of my favorite holidays is Pi Day. On March 14, people who love the math constant called pi celebrate by eating the other kind of pie. Like apple pie, pumpkin pie and even pizza pie. I talked ...