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'Weekly Problem 18 - 2011' printed from http://nrich.maths.org/

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ABCD is a square. The point E is outside the square so that CDE is an equilateral triangle. Find angle BED.
 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
 

This problem is taken from the UKMT Mathematical Challenges.

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