Nine-Point Circle
The nine-point circle associated with a given triangle passes through the perpendicular feet (green), the midpoints of the sides (black), and the midpoints (red) of the segments connecting the vertices with the orthocenter H.
Contributed by:
Chris Boucher
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Nine-Point Circle
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"
Nine-Point Circle
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http://demonstrations.wolfram.com/NinePointCircle/
Contributed by:
Chris Boucher
High School Geometry
Plane Geometry
Triangles
Circumcenters on a Circle
Largest Isosceles Triangle Inscribed in a Circle
Inscribing Four Circles in a Triangle
Four Concyclic Points
Napoleon's Theorem
The Pivot Theorem
Thales' Theorem
Euler's Triangle Formula
Side Lengths Opposite Unequal Angles
Drawing a Triangle
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