Model how to calculate the area of a trapezium using this interactive geogebra applet to dynamically convert it into a prallelogram (rotate using the blue dot). Generate new problems on demand and show/hide the lengths by clicking on them. Show/hide the area/perimeter to reveal the solutions. No need for 1/2(a+b)h with this visual prompt!
You can open this using geogebra but if you don’t want to install it you can also use it in a normal web browser using the link included.
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£2.00