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Izidor Hafner
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Demonstrations 401  420 of 821
Dissecting a Cross of Lorraine into a Square
Faces of the Regular Icosahedron and Five Regular Tetrahedra
Vega's Second Calculation of Pi
Vega's Calculation of Pi
Disk to Oval Seat Tops II
Dissecting an EvenSided Regular Polygon into Rhombuses
Disk to Oval Seat Tops
Leonardo's Dissection of a Motif to a Rectangle
Dissecting a Globular Greek Cross to a Square
Hinged Dissection of a Pentagram to a Decagon
A Regular Polygon with an Even Number of Sides Is the Union of Rhombuses
Theobald's Dissection of a Heptagon to a Triangle
A Quiz for the Longest Rivers and Largest Lakes
Common Point of Tangents
Nine Summits Quiz
Three Hinged Dissections of Squares
Dissection of a Cube into Three Bilunabirotundas, a Dodecahedron, and a Smaller Cube
A Dissection of a Prolate Golden Rhombohedron
Find the Opposite Face
Deriving the Formula for the Area of a Parallelogram
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