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Tool: Side Length and Area of Similar Figures
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Description: The user can manipulate the side lengths of one of two similar rectangles and the scale factor to learn about how the side lengths, perimeters, and areas of the two rectangles are related.
Technology Type: Java Applet 
Author: Nick Jackiw for NCTM
Language: English 
Cost: Does not require payment for use

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Teacher Review (Based on classroom experience)
Reviewer: Jeff L, Aug 13 2005 07:43:00:233PM
What did students learn? Middle level students seem to have a difficult time relating the linear scale factor to the area of a similar figure. This applet makes an interactive demonstration of that relationship - assuming the student has been introduced to the topics.
Recommended for: Math 7: Ratio and proportion, Geometry in the plane
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  Jeff L
Comment:A nice resource to demonstrate a difficult concept for middle level math.