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Triangles
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Demonstrations 261 - 280 of 739
Menelaus' and Ceva's Theorem for Spherical Triangle
A Visual Proof of Thales's Intercept Theorem
Two Equidecomposable Triangles
Spherical Right Triangles
Four Theorems on Spherical Triangles
Dissection of a Spherical Equilateral Triangle into Three Isosceles Triangles
Relations between Plane Angles and Solid Angles in a Trihedron
Supplementary Solid Angles for Trihedron
Euclid's Formula and Properties of Pythagorean Triples
Gerwien's Simultaneous Dissection of Three Triangles of Same Area
Fate of the Euler Line and the Nine-Point Circle on the Sphere
Spherical Law of Sines
Spherical Law of Cosines
Dissection of an Equilateral Spherical Triangle into Two Congruent Equilateral Spherical Triangles
Sines of the Dihedral Angles of a Tetrahedron
Rotation of the Euler Line of a Triangle
Tetrahedron Centers
The Klein Configuration
A Tetrahedron with Edges of Given Length
Recursive Similar Triangles
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