The ability to round a number to a number of decimal places or to a number of significant figures is essential if answers are to be written to the correct degree of accuracy asked for in a question.

One of the oldest calculus problems, finding the area of a circle, can be visualized using a pizza. By dividing it up into ever smaller slices and laying them out next to one another, eventually you ...

I had planned for part 2 of this series about π to be about the classical area formula for the circle, but then something new came up. Well, by new I mean a new proof of something old, and it's a ...