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Tool: Area of an Ellipse - Math Open Reference
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Go to: http://www.mathopenref.com/ellipsearea.html (opens a new window)
Description:

An interactive applet and associated web page that demonstrate the area of an ellipse. The major and minor axes can be dragged and the area is continuously recalculated. The ellipse has a grid inside it so that students can estimate the area and compare the result to the calculated one.

The web page has the formula for the area calculation.

The web page also has links to other pages defining the various properties of an ellipse and to some ellipse constructions.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Technology Type: Java Applet 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry General
PreCalculus ellipses