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Weekly Problem 37 - 2013

Stage: 3 Challenge Level: Challenge Level:1
E

The number of diagonals in an n-sided polygon is $\frac{1}{2}n(n-3)$ .

This can be used to show that A to D are all correct. A quadrilateral has half as many diagonals as it has sides, not twice as many.


This problem is taken from the UKMT Mathematical Challenges.

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