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Geometry
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Demonstrations 2201  2220 of 2904
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
Concurrent Line Segments Related to the Incircle
Projections, an Altitude, and the Orthocenter
Cubic Close Packing versus Hexagonal Close Packing
Onion Polyhedra
Sums of Squares of Segments Created by a Pedal Triangle
Concyclic Circumcenters
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