Interior crossings of a decagon's diagonals
In a convex decagon (10-gon) in general position, draw all the diagonals. Assuming no three diagonals meet at a single interior point, how many interior intersection points do the diagonals create?
Show hints (2)+
- Each interior crossing comes from a unique set of 4 vertices (a quadrilateral's two diagonals).
- So the count is .
Answer
Reveal answer →Final answer
210
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