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Geometry
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Demonstrations 2461  2480 of 3146
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
The Intersections of Extended Cevians with Three Circumcircles of Subtriangles
Tangent Lines to a Conic Section
Space Filling with TrapezoidRhombic 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 ErdösMordell Inequality
The Intersection of an Angle Bisector and a Perpendicular Bisector
Two Tangent Lines to a Parabola
Decomposing a Rhombic Dodecahedron into a TrapezoidRhombic Dodecahedron
Angle Bisectors on the Circumcircle
Angle Measure
The Product of the Inradius and Semiperimeter of a Triangle
The Product of an Altitude and the Circumradius of a Triangle
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