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Triangles
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Demonstrations 281  300 of 474
A Triangle Inequality Involving the Altitudes, Semiperimeter, Inradius, and Circumradius
Triangle Altitudes and Inradius
Angle Bisectors in a Triangle
Inscribing Four Circles in a Triangle
Routh's Theorem
Stewart's Theorem
The Semiperimeter and Tangents to Excircles
A Line Parallel to a Side of a Triangle
The Distance to the Orthocenter from a Vertex
Two Midpoints of a Trapezoid
The Hagge Circle
Bisectors of the Angles of the Orthic Triangle
The Triangles Cut Off by the Sides of the Orthic Triangle
SquareHole Drill in Three Dimensions
Inversive Geometry I: Basic Properties of Inversion
A Generalization of IMO 2008 Problem 1
A Concurrency Involving the Midpoints of the Sides and the Altitudes
Angle Bisector Theorem
The Ratio of a Side of a Triangle to the Corresponding Side of the Orthic Triangle
Concyclic Points Derived from Midpoints of Altitudes
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