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Plane Geometry
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Demonstrations 781  800 of 1199
The Sum of the Square Roots of the Areas of Three Subtriangles
The Sum of the Perimeters of Three Subtriangles
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
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