How do we measure around a circle, and what is pi?
Pi's Circle Secret
How do we measure around a circle, and what is pi?
Measuring across a circle is easy. You lay your ruler down, line to line, and you're done. But measuring AROUND it? That edge keeps curving away from you, dodging your straight ruler like a slippery fish. So how do we ever pin down the distance around a circle?
Let's give the parts of a circle their proper names. The distance straight across, through the very center, is the diameter. And the whole distance around the outside — the curvy journey — is called the circumference. Two simple ideas. One of them is being difficult.
