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Geometry
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Demonstrations 2221  2240 of 3020
A Line Parallel to a Side of a Triangle
The Distance to the Orthocenter from a Vertex
Two Midpoints of a Trapezoid
Angular Displacement
Curvature and Torsion
Gauss Code Loops
Dissecting a Hexagon into Four Smaller Hexagons
The Hagge Circle
Bisectors of the Angles of the Orthic Triangle
The Triangles Cut Off by the Sides of the Orthic Triangle
Mona Lisa and the Golden Rectangle
SquareHole Drill in Three Dimensions
Inversive Geometry I: Basic Properties of Inversion
SelfIntersections in a Polygon
The Spatial Midpoint Quadrilateral Theorem
The x^x Spindle
Product of Two LeviCivita Tensors
A Generalization of IMO 2008 Problem 1
Dust with Line Shadows in Every Direction
A Concurrency Involving the Midpoints of the Sides and the Altitudes
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