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Plane Geometry
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Demonstrations 41  60 of 1270
Area of a Polygon
Pappus's Hexagons
Freese's Dissection of a Regular Hexagon into Seven Hexagons
Inscribed Triangles in Polygons
Length of the Perpendicular from a Point to a Straight Line
Mixtilinear Incircles
Height of Object from Angle of Elevation Using Tangent
The Apollonius Circle of a Triangle
Orthopolar Lines for a Quadrilateral
The Nine 10_3 Configurations
Test Your Spatial Visualization Abilities
Total Areas of Alternating Subtriangles in a Regular Polygon with 2n Sides
Obtuse Random Triangles from Three Points in a Rectangle
Polyhedron Faces Identification
A Line Has Constant Slope
The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees
Board Inversion
Heron's Formula
Interior and Exterior Angles of Regular Polygons
Examples of Zindler Curves
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