Perpendicular Lines Generated by a Quadrilateral
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The centroid of a triangle is the intersection of the lines drawn from the vertices to the midpoints of the opposite sides.
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Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Perpendicular Lines Generated by a Quadrilateral"
http://demonstrations.wolfram.com/PerpendicularLinesGeneratedByAQuadrilateral/
Wolfram Demonstrations Project
Published: March 7 2011