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Geometry
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Demonstrations 2301  2320 of 3124
On the Areas of Triangles Associated with an Excircle
The Sum of the Circumradii of Three Subtriangles
The Sum of the Square Roots of the Areas of Three Subtriangles
The Sum of the Perimeters of Three Subtriangles
Van Aubel's Theorem for Triangles
Solving Oblique Triangles
Reflecting a Lattice of Points
Inverse Hilbert Matrix Coefficients Mod m
Two Ways to Fold a Net into a Biaugmented Triangular Prism
Dissection of a Cube into a Cuboctahedron and an Octahedron
Kempe's Angle Adder
Kempe's Angle Trisector
Distance between Two Points
Dirac Matrices in Higher Dimensions
The Sum of the Exradii Minus the Inradius
Three Ways to Fold a Net into a Snub Disphenoid
Product of Two LeviCivita Tensors with Contractions
Ceva's Theorem
A Triangle Inequality Involving the Altitudes, Semiperimeter, Inradius, and Circumradius
Triangle Altitudes and Inradius
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