| Elias Loomis - 1858 - 234 páginas
...the angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting **another straight line, makes the adjacent angles equal to one another, each of** them is called a right angle, and the straight line which meets the other is called a perpendicular... | |
| Popular educator - 1860
...equal to the base OH, and the angle CHF (I. 4) to the angle CBO ; and they are adjacent angles. But **when a straight line standing on another straight...the adjacent angles equal to one another, each of** them is a right angle, and the straight line which stands upon the other is called a perpendicular... | |
| Robert Potts - 1860 - 361 páginas
...15.) therefore the angle FHC is equal to the angle GHC; (I. 8.) and these are adjacent angles. But **when a straight line standing on another straight...the adjacent angles equal to one another, each of** them is a right angle, and the straight line which stands upon the other is called a perpendicular... | |
| Isaac Todhunter - 1860
...meet together, but are not in the same straight line. And when a straight line standing on another **makes the adjacent angles equal to one another, each of the angles is called a right angle.** A right angle is divided into 90 equal parts called degrees, a degree is divided into 60 equal parts... | |
| William Schofield Binns - 1861
...inclination of two straight lines to one another, meeting or cutting each other in a point, as c (10) " **When a straight line standing on another straight...stands on the other is called a perpendicular to it."** The angles AB c, ABD, are right angles. Obs. 1. Because DB is in the same straight line with B c, the... | |
| Janes Boddely Keene - 1861
...the angle. Plate I., Fig. 1. 10. Angles are of three kinds. Fig. 2. a. The Right Angle. — If one **straight line standing on another straight line makes the adjacent angles equal to one another, each** is .called a right angle, and the line standing on the other is said to be perpendicular to it. b.... | |
| Euclides - 1861
...st. line makes the adj. ¿_s equal to each other, each of these /.s is called a rt. ¿_ ; and the st. **line which stands on the other is called a perpendicular to it.** Ax. 1. Things which are equal to the same thing are equal to one another. EI 2 CI 2 Dat. Quass. Pst.... | |
| Euclides - 1862
...4. Therefore the angle DCF is equal to the angle ECF; (I. 8.) And they are adjacent angles. 5. But **when a straight line, standing on another straight...another, each of the angles is called a right angle;** (def. 10.) 6. Therefore each of the angles DCF, ECF, is a right angle. Conclusion. — Therefore from... | |
| Euclides - 1862
...therefore the angle AFE is equal to the angle BFE ; (i. 8) but 'when a straight line standing upon **another straight line makes the adjacent angles equal to one another, each of** them is a right anele ;' therefore each of the angles AFE, BFE, is a right angle; wherefore the straight... | |
| Euclides - 1863
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E. X. **When a straight line standing on another straight...the adjacent angles equal to one another, each of** these angles is called a right angle ; and the straight line which stands on tbo other is called a... | |
| |