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.

3.14x64 is 200.96. Meaning the area pizza is 200.96 square inches of goodness. (Photo Credit: KDKA) Now on to the smaller, 8" pizza. Half of the diameter is 4", so you multiply Pi or 3.14 times 4 ...

In honor of Pi Day, the Pie Queen shares how to cut the perfect slice. — -- In honor of Pi Day, the one day of the year that matches mathematical constant pi, the Pie Queen is teaching us how ...