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Triangles
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Demonstrations 81  100 of 589
Find the Angle Whose Sine is the Product of the Sine and Cosine of Two Other Angles
A Theorem on the Dihedral Angles of a Tetrahedron
Geometric Solution of a Quadratic Equation Using Carlyle's Circle
The Plemelj Triangle via the Fixed Point of a Transformation
Algebraic Solution of the Plemelj Triangle Construction Problem
Three Coplanar Bisectors in Unit Sphere Construction
Three Tilings of the Sphere with Right Triangles
Five Concyclic Points in a Triangle
Three EdgetoEdge Sphere Tilings with Right Triangles
Triangles with Equal Area Are Equidecomposable (Equivalent by Dissection)
Three Spherical Triangles of Equal Area
Dissection of a Composite Spherical Triangle
Dissection of a Spherical Triangle into a Square
Hinged Dissection of a Spherical Triangle into a Spherical Lune
Monge Point of a Tetrahedron
Locus of Points at Constant Distance from the Edges of a Trihedron
Inscribed and Circumscribed Spheres of a Tetrahedron
Two Conditions for a Tetrahedron to Be Orthocentric
Properties of Isosceles Tetrahedra
The Nagel Line
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