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Demonstrations 2281 - 2300 of 2973
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
Sums of Squares of Segments Created by a Pedal Triangle
The Intersections of Extended Cevians with Three Circumcircles of Subtriangles
Tangent Lines to a Conic Section
Space Filling with Trapezoid-Rhombic Dodecahedra and Hexagonal Close Packing
Space Filling with Rhombic Dodecahedra and Cubic Close Packing
Measuring Angles with a Protractor
The Sum of the Distances from the Orthocenter to the Vertices
Medial Division of Triangles
The Erdös-Mordell Inequality
The Intersection of an Angle Bisector and a Perpendicular Bisector
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