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A starting point: dissection and rearrangement
Here are two parallelograms. For each one, can you see how you can cut it into pieces and rearrange those pieces to form a rectangle? There is more than one way to do it for each parallelogram. The applet below shows you one example of how to do it for each one; simply click the “Cut and rearrange” buttons to see the animation.
Area of a parallelogram
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Interactive GeoGebra activity: create a parallelogram with a given area
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