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This lesson from Illuminations helps students to begin to develop an understanding of area by using a Java applet on the computer. Learners use 12" × 12" paper squares to measure the area of a door and determine whether area increases or decreases as the length or width of their door changes. The lesson includes discussion questions, extensions, and other teacher support. It is supported by the applet IGD: Areas in Geometry (cataloged separately).
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