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Plane Geometry
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Demonstrations 1001 - 1020 of 1465
Concyclic Points Associated with an Angle Bisector and an Excircle
Dividing a Triangle by Lines Parallel to Two Sides
Subtriangles Formed by Concurrent Lines Parallel to the Sides of a Triangle
Reflecting a Point through the Midpoints of a Triangle's Sides
Equal Chords
The Area of the Incentral Triangle
Areas of Parallelograms and Trapezoids
Protractor Practice
A Concurrency from Circumcircles of Subtriangles
A Concurrency from the Midpoints of Line Segments through the Circumcenter
A Concurrency from the Reflections of the Contact Points with the Excircles
Arc Length of Cycloid
A Concurrency from a Point and a Triangle's Excenters
Concyclic Points from Reflections of the Circumcenter about the Altitudes
Two Hinged Dissections
Line through Two Points
Théorème de Pappus (French)
Reflection of Parallel Rays by a Sphere
Collinearity of a Triangle's Circumcenter, Incenter, and the Contact Triangle's Orthocenter
2-by-n Disk-Packing Paradox
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