G16b – Area of a parallelogram

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Prerequisites

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

Teacher resources

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  • Slides in PPTX (with click-to-reveal answers)
  • Slides in PDF (one slide per page, suitable for importing into IWB software)
  • Further material on this topic embedded here (log in to see)

Interactive GeoGebra activity: create a parallelogram with a given area

In the real world

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