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Solid Geometry
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Demonstrations 21  40 of 560
Three EdgetoEdge Sphere Tilings with Right Triangles
Three Spherical Triangles of Equal Area
Dissection of a Composite Spherical Triangle
Dissection of a Spherical Square into a Spherical Lune
Dissection of a Spherical Triangle into a Square
Hinged Dissection of a Spherical Triangle into a Spherical Lune
Dissection of a Spherical Triangle into a Spherical Lune
Dissection of Gerwien's Triangle into a Saccheri Quadrilateral on the Sphere
Orthogonal Projections of the Edges of a Cube
Monge Point of a Tetrahedron
Locus of Points at Constant Distance from the Edges of a Trihedron
Three Planes in a Trihedron
Locus of Centers of Spheres
Inscribed and Circumscribed Spheres of a Tetrahedron
Two Conditions for a Tetrahedron to Be Orthocentric
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
Dome of Viviani Windows
RightAngled Tetrahedron
Three Tangents to a Sphere
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