| Quadrilateral with four squares by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"• | by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"• Quadrilateral with four squares by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"• by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"• MathWorld — A Wolfram Web Resource |
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| MathWorld — A Wolfram Web Resource |