2006 Cyprus MO/Lyceum/Problem 21
Revision as of 12:21, 26 April 2008 by I like pie (talk | contribs) (Standardized answer choices; minor edits)
Problem
A convex polygon has sides and diagonals. Then equals
Solution
The number of diagonals in a polygon is . In this case, , so .
By solving the quadratic equation, we find , so the answer is .
See also
2006 Cyprus MO, Lyceum (Problems) | ||
Preceded by Problem 21 |
Followed by Problem 22 | |
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