 | Edward Atkins - 1874 - 428 σελίδες
...it may be expressed by the letter at that point, as the angle E. 10. 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... | |
 | Euclides - 1874 - 342 σελίδες
...therefore 1. The cmgle ADG is equal to the angle GDB (I. 8), 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... | |
 | George E. Webster - 1874 - 136 σελίδες
...lines whicli meet together, but do not form the same straight line. 4- When a straight line standing on another straight line makes the adjacent angles equal to one another, thia line is said to be at right angles to the line on which it stands. A Right Angle equals 90°,... | |
 | Henry Lewis (M.A.) - 1875 - 104 σελίδες
...angle," but it is, perhaps, a little too difficult for beginners: — When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle. An acute angle is less than a right angle, as ABD, DEE. An obtuse... | |
 | Francis Cuthbertson (geometer.) - 1876 - 102 σελίδες
...Wherefore if two straight lines &c. QED RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line, makes the adjacent angles equal to one another, each of them is called a right angle ; and the straight line which stands upon the other is - said to be perpendicular... | |
 | Edward Atkins - 1876 - 130 σελίδες
...is equal to the angle EOF (I. 8) ; And they are adjacent angles. But when a straight line, standing on another straight line, makes the adjacent angles equal to one another, each of the angles is callccl a. right angle (Def. 10) ; AD = Make CE = CD nnj A DBF equilatcral. * EC*' .... | |
 | Robert Potts - 1876 - 446 σελίδες
...that which is contained by DB. CB, is called the angle DBC, or CUD. X. When a straight 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 which stands on the other is called a... | |
 | George Elliot Voyle, G. de Saint-Clair-Stevenson - 1876 - 676 σελίδες
...applied to substantive rank (viile Rank) in the army. Perpendicular — When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is a right angle, and the line perpendicular. Persian Wheel — A contrivance for raising... | |
 | Richard Wormell - 1876 - 268 σελίδες
...have a common vertex, and are on opposite sides of a common side. 1 8. When one straight 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 which stands on the other is said to be... | |
 | Edward Atkins - 1877 - 72 σελίδες
...it may be expressed by the letter at that point, as the angle K 10. "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... | |
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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. 
