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" If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines. "
Elements of Geometry: With Practical Applications to Mensuration - Page 168
by Benjamin Greenleaf - 1868 - 320 pages
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Solid Geometry and Mensuration

Daniel Tell Sigley, William Timothy Stratton - Geometry, Solid - 1942 - 176 pages
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Plane and Spherical Trigonometry

Harvey Alexander Simmons - Trigonometry - 1945 - 536 pages
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Logic for Mathematicians

John Barkley Rosser - Logic, Symbolic and mathematical - 1953 - 552 pages
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Logic for Mathematicians

John Barkley Rosser - Logic, Symbolic and mathematical - 1953 - 552 pages
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Mathematics for the Secondary School: Its Content and Methods of Teaching ...

William David Reeve - Mathematics - 1954 - 568 pages
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Mathematics and Mechanics for Engineers, Volume 1

Oscar Bernard Jones - Mathematics - 1960 - 450 pages
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Vectors in Three Dimensional Geometry

Abraham M. Glicksman - Geometry, Solid - 1961 - 72 pages
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Journal of the Franklin Institute, Volume 276

Franklin Institute (Philadelphia, Pa.) - Electronic journals - 1963 - 606 pages
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Geometry with Coordinates: Student's Text, Volume 2

School Mathematics Study Group - Geometry - 1963 - 532 pages
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Proceedings, Volume 4

1965 - 592 pages
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