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Geometry
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Demonstrations 2121  2140 of 2831
Circumradii Perpendicular to the Sides of the Orthic Triangle
Perpendiculars from the Midpoints of the Orthic Triangle
Collinear Orthocenters
The Ulam Prime Spiral
Line Segments through the Vertices and the Circumcenter of an Acute Triangle
Circles through the Orthocenter
Concyclic Points Related to a Midpoint and the Incircle
An Altitude and Four Concyclic Points
Products of Segments of Altitudes
Perpendicular Lines Generated by a Quadrilateral
Rectangular Prisms
Dissecting a Rhombic Dodecahedron into Two Solids
The Third Pedal Triangle of a Triangle
Pythagorean Triangles with the Same Area
Miquel's Theorem
The First Lemoine Circle
The Area of a Triangle, its Circumradius, and the Perimeter of its Orthic Triangle
Symmetric Compositions of Rhombic Dodecahedra of the Second Kind
Concurrent Lines that Intersect on the Euler Line
Collinearity of an Orthocenter, the Incenter, and the Circumcenter
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