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Plane Geometry
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Demonstrations 1021 - 1040 of 1465
The Schiffler Point
Products of Diagonal Lengths in the Regular Polygon
A Concurrency Generated by Lines through the Orthocenter and Circles about a Triangle's Sides
Another Concurrency Generated by Circles about a Triangle's Sides and Lines through an Internal Point
A Concurrency Generated by Circles about a Triangle's Sides and Lines through an Internal Point
A Circumcircle through the Midpoint of a Triangle's Side
A Concurrency Generated by the Angle Bisectors
Tangent Lines to a Parabola
The Gergonne Point
The Intersection of Circumcircles of Medial Triangles
Intersecting Circles and a Right Angle
Pappus's Hexagon Theorem
A Cyclic Quadrilateral Concurrency
The Line through the Incenter and Circumcenter
A Collinearity between the Nine-Point Center, the Foot of an Altitude, and a Midpoint
A Triangle Formed by the Centers of Three Nine-Point Circles
A Parallelogram with Vertices on Two Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
Ammann Chair
Recursively Defined Partial Tilings of the Plane
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