Explore the formula for the area of a circle, by cutting it into sectors and rearranging the sectors to form a figure close to a parallelogram. By increasing the number of sectors, students can observe that the figure tends to a rectangle, and get the formula for the area of the circle by finding the area of this rectangle.
This version includes minor adaptations from the original that include moving some objects, new colors or styles for some objects, scripts for resetting features, adding or modifying some objects, increasing it's ease of use on tablets such as an iPad, and making many objects un-selectable.
Thank you Anthony Or for sharing a wonderful applet.
Original applet by Anthony Or. Education Bureau, Hong Kong
See also Anthony Or's original applet at http://geogebratube.org/student/m279
See how Anthony Or designed the applet at http://www.geogebratube.org/material/show/id/15215.
Anthony Or's contact information: orchiming@gmail.com
