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Antonio Gutierrez
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Demonstrations 21  38 of 38
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
Tangents to an Excircle
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
Incircles and a Cevian
The Midpoints of Two Cevians
The Quadrilateral of Centroids
The Area of the Contact Triangle
Perpendiculars to a Chord
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