Missing square puzzle
Optical illusion
Missing square puzzle
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations. Each apparently forms a 13 × 5 right-angled triangle, but one has a 1 × 1 hole in it.
Read on Wikipedia · Image Original: Krauss Vector: cmglee, CC BY-SA 4.0
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