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Plane Geometry
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Demonstrations 801  820 of 1195
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
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
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