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Keywords: Missing square puzzle animation.gif Uploaded with en wp UW marker 2012 05 29 The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures It depicts two arrangements of shapes each of which apparently forms a 13×5 right-angled triangle but one of which has a 1×1 hole in it 2012-05-29 http //imgur com http //imgur com http //imgur com/lYy5b http //imgur com Animated GIF Missing square puzzle |