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Triangles
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Demonstrations 181  200 of 442
Tangents to the Incircle from a Point on the Circumcircle
Equilateral Triangles That Form a Star
Sum of a Geometric Series
Circumcenter of a Triangle
Interior Angles of a Triangle
Area of a Disk
Altitudes and Incircles
A Collinearity Involving an Excircle, the Incircle, and the Circumcircle
The Desargues Configuration
Points Symmetric to the Orthocenter with Respect to the Sides of a Triangle
Reflections of a Point in the Midpoints of a Triangle's Sides
Products Determined by a Point on the Circumcircle
Division of an Angle Bisector by the Incenter
Drilling a Hexagonal Hole
Perpendiculars from a Point on the Line between the Endpoints of the Angle Bisectors
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
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