Copyright © University of Cambridge. All rights reserved.

See all short problems arranged by curriculum topic in the short problems collection

A square is labelled anticlockwise ABCD.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.*