Circumference of a Circle: What is p?

The applet gives one explanation of what is p and why there is p in the formula for the circumference of the circle. Please refer to the worksheet and answer the questions there.

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)

Tibor Marcinek, Created with GeoGebra