Regular polygons

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Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
1-2
3-4
5-6
7-8
9-10
11-12
13-14

Presenting one idea together with a collection of problems based on that idea is the
comfort food of math circle lesson plans. This Razvan Gelca lesson lists problems related ot regular polygons (and their solutions). Of course for the lesson, the leader would not give the problems. The leader would describe the idea, pass out the problems and let groups of students work together on the problems. The students would present their solutions, as they were found.