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Izidor Hafner
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Demonstrations 521  540 of 946
Dissecting One Equilateral Triangle into Seven
Folding a Net into an Octahedron Or Two Tetrahedra
Dissecting a Square into a Sphinx
Dissection of Two {8/2}Prisms into One
Dissecting an Equilateral Triangle into Three Smaller Ones
Dissecting a Decagon into a Pentagram and Two Pentagons
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
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