 | John Playfair - Euclid's Elements - 1846 - 332 pages
...angle ADG is equal (8. 1.) to the angle GDB : But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle (7. def. 1.) Therefore the angle GDB is a right angle : But FDB is likewise a right angle... | |
 | Euclides - 1847 - 128 pages
...Definition 18. 10. When a straight line, standing on another straight line, makes the adjacent an. gles 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. 11. An obtuse angle is that... | |
 | Euclid, Thomas Tate - 1849 - 120 pages
...angle ADG is equal (i. 8.) to the angle GDB: But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle (i. Def. 10.) : Therefore the angle GDB is a right angle: But FOB is likewise a right... | |
 | Janet Taylor - Nautical astronomy - 1851 - 692 pages
...from the circle by the lines which form the angle. 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 : thus the line AC is perpendicular... | |
 | Euclides - 1852 - 152 pages
...nearer to AC or EF than BA does.] B 2 BOOK I. BOOK I. 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. [That there may be two such... | |
 | Euclides - Geometry - 1853 - 176 pages
...angle adg is equal (i. 8) to the angle gd b' But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle (i. def. 10) : therefore the angle gdb is a right angle : but f db is likewise a right... | |
 | Royal Military Academy, Woolwich - Mathematics - 1853 - 400 pages
...angle ADG is equal (8. i.) to the angle GDB : but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle (10 Def. i.); therefore the angle GDB is a right angle : But FDB is likewise a (Constr.)... | |
 | Euclides - 1853 - 146 pages
...1. The angle ADG is equal to the angle GDB: but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle (I. Def. 10.); therefore 2. The angle GDB is a right angle: but FDB is likewise (Constr.)... | |
 | William Somerville Orr - Science - 1854 - 534 pages
...straight line (AB) standing on another straight line (CD) makes the adjacent angles (А В С, А В D) equal to one another, each of the angles is called a right angle ; and the straight lines are said to be perpendicular to each other. Thus the two lines, AB, CD, are perpendicular... | |
 | Robert Rawson - 1856 - 178 pages
...letter placed at that point ; as the angle at E." 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. XL An obtuse angle is that... | |
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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. 
