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Plane Geometry
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Demonstrations 801  820 of 1217
Van Aubel's Theorem for Triangles
Solving Oblique Triangles
Reflecting a Lattice of Points
Kempe's Angle Adder
Kempe's Angle Trisector
Distance between Two Points
The Sum of the Exradii Minus the Inradius
Ceva's Theorem
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
Angular Displacement
Dissecting a Hexagon into Four Smaller Hexagons
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