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Plane Geometry
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Demonstrations 1201 - 1220 of 1465
A Congruent Angle inside the Incircle
The Area of a Triangle inside the Incircle
The Radii of Four Incircles
A Relation between Altitudes of Four Triangles
A Relation between the Contact Triangles of a Triangle
A Parallelogram Defined by the Centers of Four Incircles
A Relation between the Areas of Four Triangles
Three Subtriangles of a Triangle
A Triangle and an External Contact Triangle
Contact Triangles of a Triangle
Dissecting an Octagon into Four Smaller Octagons
Tangents to an Excircle
Dissecting a Decagon into Two Pentagons and Two Pentagrams
Two-Octagons-into-One Dissection in Two Steps
Freese's Two-Octagons-into-One Dissection
Any Quadrilateral Can Tile
Cube Net or Not
Lines Parallel to the Sides of a Triangle
Two Lines Determine a Circle
Linear Transformations of a Polygon
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