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Plane Geometry
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Demonstrations 941  960 of 1097
The Ratio Theorem
The Butterfly Theorem
Intersecting Secants Theorem
Euler's Triangle Formula
Cyclic Quadrilaterals, Subtriangles, and Incenters
Intersecting Chords Theorem
Maurer Roses
Opposite Angles of a Quadrilateral in a Circle
Largest Isosceles Triangle Inscribed in a Circle
Newton's Ellipse
HadwigerFinsler Inequality
Intersection of Two Circles
Einstein's Most Excellent Proof
Circles & Triangles
Pythagorean Analogs for Similar Triangles
Wittenbauer's Parallelogram
Tension in a Hanging Chain
Delannoy Path Exhaustion Diagonal
Lattices in Perspective
Circumcircle and Incircle of a Triangle
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