Pi

What is pi? Why is it approximately 3.14?

This small applet demonstrates circumference of a circle with diameter 1.

<Show embed code>

<iframe fullscreen="" height="310px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/th6ahubq/width/700/height/310/border/000000/rc/false/ai/false/sdz/false/smb/false/stb/false/stbh/false/ld/false/sri/false" style="border: 0px;" width="700px"> </iframe>