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Geometry
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Demonstrations 2261  2280 of 2929
The Product of an Altitude and the Circumradius of a Triangle
Dissecting Two Rhombic Dodecahedra of the Second Kind into a Cube
An IMO Problem Involving Concurrency
The Product of the Side Lengths of a Triangle
The Medial Triangle and Concurrency at the Nagel Point
Four Concurrent Lines in a Cyclic Quadrilateral
A First Morley Triangle Concurrence
Relations between Some Triangles Associated with Excircles
Three Ways to Fold a Net of Eight Triangles
Octahedral Vase
The Extouch and Intouch Triangles of a Triangle
A Relation between Incircles and Excircles
A Generalization of Hansen's Theorem
Sydler's Dissection of a Pyramid into a Prism
Dissecting the Triangular Hebesphenorotunda (Johnson Solid 92)
Two Ways of Folding a Sphinx into a Triangular Dipyramid
A Parallelogram Defined by the Centers of Four Circumcircles
Decomposing a Rhombic Solid into a Truncated Octahedron
Estimating Perimeter and Area of Simple Polygons
The Contact Triangle and Two Other Subtriangles
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