I was also part of this competition. Are you year 11 or 12, I'm year 12. I did not do any of the last 5, including this one, because they were so different and unusual to what I have seen before. I didn't have time to waste on this question when I would never have got a correct answer. (But I did have a 1 in 1000th chance.)
I don't remember the circle question, there was one similar if I remember correctly with 12 vertices and it asked for the number of chords for something...?
But yeah, It was pretty difficult...
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