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" If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to the plane which passes through them, that is, to the plane in which they are. "
Euclid's Elements: Or, Second Lessons in Geometry,in the Order of Simson's ... - Page 133
by Dennis M'Curdy - 1846 - 138 pages
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Euclid's Elements, Books 1-6; Book 11

Euclid - Geometry - 1933 - 328 pages
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The New Geometry Complete: The Agreed Scheme Drawn Up by ..., Volumes 1-5

Alexander Symon - Geometry - 1935 - 722 pages
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Solid Geometry and Mensuration

Daniel Tell Sigley, William Timothy Stratton - Geometry, Solid - 1942 - 176 pages
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The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid - 2001 - 420 pages
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Exercises in Mathematics

David Beveridge Mair - Mathematics - 1914 - 469 pages
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Examinations Papers

1882 - 496 pages
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Oxford, Cambridge and Dublin Messenger of Mathematics, Volume 5

Mathematics - 1871 - 292 pages
...are the middle points of the sides and A,B,C the intersections of opposite sides. EUCLID XI., &c. I. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angUs to the plane which passes through...
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Companion to the Weekly Problem Papers: Intended for the Use of Students ...

John James Milne - Algebra - 1999 - 372 pages
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Calendar

University of St. Andrews - 1900 - 670 pages
...How can the fourth point of a harmonic range be found, when three points of the range are given ? 6. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to their plane. The sum of the squares...
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The Elements of Geometry: Or, The First Six Books, with the Eleventh and ...

Euclid - Euclid's Elements - 1859 - 254 pages
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