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Plane Geometry
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Demonstrations 781  800 of 1229
Calculating Area, Perimeter, and Diagonal Length of a Rectangle
Pappus's Hexagon Theorem
A Cyclic Quadrilateral Concurrency
The Line through the Incenter and Circumcenter
A Collinearity between the NinePoint Center, the Foot of an Altitude, and a Midpoint
A Triangle Formed by the Centers of Three NinePoint 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
Ammann Tiles
Dual Billiards
Kosnita's Theorem
A Concurrency of Lines Joining Orthocenters
Two Triangles of Equal Area on Either Side of an Angle Bisector
The Distances to the Incenter and Excenters from the Circumcenter
A Parabolic Mirror
Dissecting a Regular Triangle into Three Similar Tiles
Point in Triangle
Inscribed and Central Angles in a Circle
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