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A geometry puzzle centered around the triangle or the centers of a triangle.

3 votes

Professor Rackbrane: Count the triangles

Here is a slightly different solution which focuses on vertices:
Will.Octagon.Gibson's user avatar
4 votes
5 answers
1k views

Professor Rackbrane: Count the triangles

Professor Rackbrane has just given me the following puzzle as an example of those that interested his party at Christmas. Draw a pentagon, and connect each point with every other point by straight lin …
Will.Octagon.Gibson's user avatar