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 Vollansicht - Über dieses Buch
...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...
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. 
