Dudeney's famous haberdasher puzzle (1908)[br][br]Cut an equilateral triangle into four pieces[br]that can be arranged to form a square[br]with the same area

Find a construction ![br][br]Download lesson plan Dudeney.pdf [br][br][url]http://new-twinspace.etwinning.net/c/document_library/get_file?uuid=46edd6a1-2c82-4431-9301-fcf05cd88165&groupId=34128894[/url][br][br]Looking forward to hear your comments and experiences in the classroom.