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The software for all this is available from Cinderella.
Java-based images to use now on this page.
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Areas of trapeziums
What is the connection between the lengths shown and the area?

Move point C or D to the left or right so that the height remains the same. What happens to the area?
What is the "formula" for the area of a trapezium?

Please enable Java for an interactive construction (with Cinderella).


Any comments gratefully received.
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