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Plane Geometry
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Demonstrations 821  840 of 1139
Projections, an Altitude, and the Orthocenter
Sums of Squares of Segments Created by a Pedal Triangle
Concyclic Circumcenters
The Intersections of Extended Cevians with Three Circumcircles of Subtriangles
Measuring Angles with a Protractor
The Sum of the Distances from the Orthocenter to the Vertices
Medial Division of Triangles
The ErdösMordell Inequality
The Intersection of an Angle Bisector and a Perpendicular Bisector
Two Tangent Lines to a Parabola
Angle Bisectors on the Circumcircle
Angle Measure
The Product of the Inradius and Semiperimeter of a Triangle
The Product of an Altitude and the Circumradius of a Triangle
An IMO Problem Involving Concurrency
The Product of the Side Lengths of a Triangle
The Medial Triangle and Concurrency at the Nagel Point
Four Concurrent Lines in a Cyclic Quadrilateral
A First Morley Triangle Concurrence
Relations between Some Triangles Associated with Excircles
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