On a circular island we build n straight dams going from sea to sea, so that every 2 intersect but no 3 go through the same point. Use Euler's formula to determine how many parts we get.

Euler characteristic

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vilaskumar

On a circular island we build n straight dams going from sea to sea, so that every 2 intersect but no 3 go through the same point. Use Euler's formula to determine how many parts we get.

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