Line Perpendicular to Two Intersecting Lines
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If a line is perpendicular to each of two intersecting noncollinear lines at their point of intersection, then the line is perpendicular to the plane determined by them.
Contributed by: Heather Byrne (March 2011)
Open content licensed under CC BY-NC-SA
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"Line Perpendicular to Two Intersecting Lines"
http://demonstrations.wolfram.com/LinePerpendicularToTwoIntersectingLines/
Wolfram Demonstrations Project
Published: March 7 2011