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A graph is a set of vertices (or nodes), together with a set of edges (or arcs).
Look at the graphs below. You can print them off as a set of cards here.
Can you find graphs that you think 'belong' together in some sense?
Can you describe the features they have in common?
Could you draw more graphs that 'belong' in the same set?
Click below to see some definitions used to describe graphs.
Can you find examples on the cards that match each definition? Can you draw some more examples of your own?