Investigating Geometry with GeoGebra

Henrico County Public Schools

Approximate the Area of a Circle

READ the instruction below and INTERACT with the GeoGebra applet on the right.

  1. Move the green point half-way across the slider.

  2. ?

  3. Move the green point on the slider completely to the right.

  4. ?

  5. Using this information, what would be a formula for finding the area of a circle?
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)