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Plane Geometry
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Demonstrations 841  860 of 1229
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
Concyclic Points Derived from Midpoints of Altitudes
Problems on Circles VI: Poncelet Transversals
Inversive Geometry III: Inverting an Ellipse
Inversive Geometry II: The Peaucellier Inversor Mechanism
Spiral Formations from Iterated Exponentiation
The Mystery of the Disappearing Square
A Parallelogram Related to the Excircles
Bisecting a Line Segment through the Orthocenter
A Collinearity from the Medial and Excentral Triangles
Circumcircles Intersecting at the First Fermat Point
Collinearity of an Incenter and Two Circumcenters
A Hexagon with Opposite Sides Parallel
The Product of the Perpendiculars to the Sides of a Triangle
Tangents to the Circumcircle at the Vertices
Displacement versus Distance
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