 When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.  A course of geometrical drawing - Page 2by William Schofield Binns - 1861Full view - About this book
 | T S. Taylor - 1880 - 152 pages
...lines to any point .in CD and join A B.) A D DEFINITION OF RIGHT ANGLES. JTigr.J. Euc. Def. io.) — When a straight line, .standing on another straight...the straight line •which stands on the other is -A. -0 .* said to be perpendicular to it. Thus the straight line CD is said to stand on the straight... | |
 | Marianne Nops - 1882 - 278 pages
...smaller than a right angle, called acute (Lat. acutus, sharp). These are thus defined by Euclid : — 10. ' When a straight line standing on another straight...stands on the other is called a perpendicular to it.' 11. 'An obtuse angle is that which is greater than a right angle.' 12. 'An acute angle is that which... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 426 pages
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which \... | |
 | Stephen Thomas Hawtrey - 1884 - 186 pages
...leads on to the Definitions 10, 11, and 12 of Euclid, which are as follows : Definition 10.—When a straight line standing on another straight line...stands on the other is called a perpendicular to it. Definition}.}..—An obtuse angle is that which is greater than a right angle. Definition 12.—An... | |
 | Stewart W. and co - 1884 - 272 pages
...but are not in the same straight line. An angle is named from three or one letters, as ABC or B. X. When a straight line standing on another straight...and the straight line which stands on the other is _ called a perpendicular to it. XI. An obtuse angle is greater than a right angle. XII. An acute angle... | |
 | Euclides - 1884 - 434 pages
...a straight line stands on another straight line, and makes the adjacent angles equal to each other, each of the angles is called a right angle ; and the...stands on the other is called a perpendicular to it. CUD Thus, if AB stands on CD in such a manner that the adjacent angles ABC, ABD are equal to one another,... | |
 | Euclides - 1884 - 214 pages
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle, and the straight line...stands on the other is called a perpendicular to it. PROPOSITION XIII. THEOREM. The angles which one straight line makes with another straight line on one... | |
 | Euclides - 1884 - 182 pages
...line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is... | |
 | 1884 - 434 pages
...bine standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it." Let us then take two sets of such lines and apply one to tjie other, so that the feet of the perpendiculars... | |
 | Mathematics - 1885 - 150 pages
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it." Let us then take two sets of such lines and apply one to the other, so that the feet of the perpendiculars... | |
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