How many four-sided figures appear in the diagram?

There are a number of these geometric combinometrics problems around.  Here is a complete graphic solution to the one of the more common ones.

Question: How many four-sided figures appear in the diagram below?

  • 10
  • 16
  • 22
  • 25
  • 28

Answer: 25

Yaacov Apelbaum - How many four sided figures

 

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