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Plane Geometry
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Demonstrations 801  820 of 1205
Routh's Theorem
Stewart's Theorem
The Semiperimeter and Tangents to Excircles
A Line Parallel to a Side of a Triangle
The Distance to the Orthocenter from a Vertex
Two Midpoints of a Trapezoid
Angular Displacement
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
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
Angle Bisector Theorem
The Ratio of a Side of a Triangle to the Corresponding Side of the Orthic Triangle
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