 | Euclides - 1862 - 140 sider
...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 - 172 sider
...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 - 122 sider
...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... | |
 | Euclides - 1863 - 74 sider
...angle EDC? arc eg, of angle EDO, &c. A degree is the 300th part of the circumference of a circle. 10. When a straight line standing on another, straight line makes the adjacent angles equal to each other, each of these angles is called a right angle; D and the straight line which stands on the... | |
 | Euclides - 1864 - 448 sider
...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... | |
 | Euclides - 1864 - 262 sider
...the angle ABI), or DBA ; and that which is contained by DB, CB, is called the angle DEC, or CBD. 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 the other is called a... | |
 | Robert Potts - 1865 - 528 sider
...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... | |
 | Euclides - 1865 - 80 sider
...lines which meet in a point, called the vertex of an angle, and the two lines are called its sides. 9. When a straight line standing on another straight line makes the adjacent angles equal, each of them is called a RIGHT ANGLE; and the straight line which stands upon the other is called a... | |
 | Euclides - 1865 - 402 sider
...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 angle ; (i. def. 10) therefore each of the angles AFE, BFE, is a right angle; wherefore... | |
 | William Harris Johnston - 1865 - 478 sider
...other angle between them, such as the angles ВАС and DA 0. When one straight line standing upon another straight line makes the adjacent angles equal to one another, each such angle is called a right angle, and either of the straight lines is said to be a perpendicular... | |
| |
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. 
