Reread paragraph 5 of "The Duck and the Smartphone."
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There are shapes which are cut into sections and would be made into a larger shape if they were fitted together. One good example of this would be a half circle and another half circle; because if they were joined together, they would be a full circle.
With this in mind, there are different forms through which smaller shapes can be fitted together to become a larger shape and they could be a half trapezium, etc.
Please note that your question is incomplete so I gave you a general overview so that you could have a better understanding of the concept.
Read more about shapes here:
