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" To erect a straight line at right angles to a given plane, from a point given in the plane. Let A be the point given in the plane. "
Books 10-13 and appendix - Seite 294
von Euclid - 1908
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The Thirteen Books of Euclid's Elements

562 Seiten
...a line is merely drawn from a point in the plane parallel to the perpendicular obtained in xi. ii. PROPOSITION 1 2. To set up a straight line at right...reference. Let any elevated point B be conceived, from B let BC be drawn perpendicular to the plane of reference, [xi. n] and through the point A let AD be...
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