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Izidor Hafner
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Demonstrations 101  120 of 969
Dissection of an Equilateral Spherical Triangle into Two Congruent Equilateral Spherical Triangles
Sines of the Dihedral Angles of a Tetrahedron
Dissection of an Octagram into Five Octagrams
Dissection of a Spherical Square into Two Spherical Regular Pentagons
Dissection of Two Spherical Triangles to Three Spherical Squares
Op Art on a Sphere
Hanegraaf's Dissection of a Truncated Octahedron into a Hexagonal Prism
Hinged Dissection of a Regular Heptagon into Eight Smaller Ones
Hinged Dissection of a Hexagram into Seven Smaller Ones
Dissection of a Regular Dodecagon into Six Smaller Ones
Descartes's Rule of Signs
Sturm's Theorem for Polynomials
Rational Roots of a Polynomial
Dissection of an Dodecagram into Three Dodecagrams
Dissection of a Regular Dodecagon into Three
Dissection of a Regular Heptagon into Eight
Dissection of One Regular Heptagon into Seven
Dissection of One Hexagram into Seven
Rosettes from Op Art Patterns
Constructing a Square Pyramid without Gluing
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