Douglas Hofstadter - Feuerbach’s Theorem: A Beautiful Theorem Deserves a Beautiful Proof

Douglas Hofstadter - Feuerbach’s Theorem: A Beautiful Theorem Deserves a Beautiful Proof

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UMD Department of Mathematics • 12K views

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Math topics:
_Triangle_geometry_##Triangle geometry##_Right_triangle_##Right triangle##_Triangle_##Triangle##_Circumscribed_circle_##Circumscribed circle##_Isosceles_triangle_##Isosceles triangle##_Napoleon's_theorem_##Napoleon's theorem##_Equilateral_triangle_##Equilateral triangle##_Curves_##Curves##_Circle_##Circle##_Chord_(geometry)_##Chord (geometry)##_Ellipse_##Ellipse##_Geometry_##Geometry##_Intersection_##Intersection##_Geometry_##Geometry##_Cartesian_coordinate_system_##Cartesian coordinate system##_Elementary_geometry_##Elementary geometry##_Perpendicular_##Perpendicular##_Bisection_##Bisection##_Edge_(geometry)_##Edge (geometry)##_Inscribed_figure_##Inscribed figure##_Addition_##Addition##_Addition_##Addition##_Plus_and_minus_signs_##Plus and minus signs##_Summation_##Summation
Other topics:
_Logical_consequence_##Logical consequence##_Theorem_##Theorem##_Mathematical_proof_##Mathematical proof##_Measurement_##Measurement##_Greek_letters_##Greek letters##_Beta_##Beta##_Alpha_##Alpha##_Gamma_##Gamma
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