 | Euclides - 1865 - 402 pages
...ECF; (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 called a right angle ;' (def. 10) therefore each of the angles DCF, ECF, is a right angle. Wherefore, from the point C,... | |
 | Robert Potts - 1865 - 528 pages
...angle 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 the angle GDB is a right angle : but FDB is likewise a right... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 424 pages
...angle ADG is equal to the angle BDG. [I. 8. But 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 ; [I. Definition 10. therefore the angle BDG is a right angle. But the angle BDF is also a right angle.... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...angle ADG is equal to the angle BDG. [I. 8. But when a straight line, standing on another straight line, makes the adjacent angles equal to one another, each of the angle's is called "a right angle ; [I. Definition 10. therefore the angle BDG is a right angle. But... | |
 | Robert Potts - 1868 - 434 pages
...angle 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 the angle GDB is a right angle : but FDB is likewise a right... | |
 | Isaac Todhunter - Measurement - 1869 - 312 pages
...angle, or four times another angle ; and so on. 8. 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, in the figure, if the... | |
 | Euclides - 1871 - 136 pages
...the definition. IX. When a straight line (as AS) meeting another straight line (as CD) makes the A adjacent angles equal to one another, each of the angles is called a RIGHT ANGLE; and each line is said to be a PEEPENDICULAB to the other. c X. An OBTUSE ANGLE is one which is greater... | |
 | Euclides, James Hamblin Smith - Geometry - 1872 - 376 pages
...extension of the definition. IX. When a straight line (as AB) meeting another straight line (as CD) makes the adjacent angles equal to one another, each of the angles is called a EIGHT ANGLE; and each line is said to be a PER. _^_ PENDICULAR to the other. X. An OBTUSE ANGLE is... | |
 | Henry Major - Student teachers - 1873 - 588 pages
...named from three or one letters, as ABC or B. X. When a straight line standing oil 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. XI. An obtuse angle is greater... | |
 | William Alexander Myers - Circle-squaring - 1873 - 238 pages
...; *that is, having a common center, as at F. 14. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular to it; IKL... | |
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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. 
