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This sketchpad file can be used along with students using manipulative cutouts of a trapezoid to discover the formula for the area of a trapezoid. Using this program allows the trapezoid to be resized and/or changed. Students can observe that the same formula will always find the area.
This file can be used with any curriculum to help students understand the reason why the formula for a trapezoid works.
You must have the Geometer's Sketchpad Program to use this file.
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