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Plane Geometry
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Demonstrations 821  840 of 1075
Mixtilinear Incircles
Two Lines Determine a Circle
Linear Transformations of a Polygon
Loculus of Archimedes
Matrix Transformation
Golden Spiral
The Minkowski Sum of a Disk and a Polygon
A Lemma of Archimedes about a Bisected Segment
Tangent Points on a Semicircle
Area of a Triangle inside the Incircle
Tangent Circles and Parallel Diameters
Adams' Circle and the Gergonne Point
Interior and Exterior Angles of Equilateral Figures
Cofunction Identities for Sine and Cosine
Incircles and a Cevian
The Midpoints of Two Cevians
The Quadrilateral of Centroids
The Area of the Contact Triangle
Perpendiculars to a Chord
The Minkowski Sum of Two Triangles
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