In particular, after a quick refresher of circle basics, we’re going to figure out why the equation for the circumference of a circle that we all learned in school works, and we’re also going ...

A one-minute video on how to show the circumference of a circle is π x diameter. π is 3.14 to 2 decimal places. ... Find out more by working through a topic. What is pi? count. 8 of 50. Area. count.

Successful 5th graders learn that the circumference of a circle is equal to pi times the circle’s diameter: c = pi x d. That is a fairly useless lesson—a computer can do it more quickly and ...