 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 : (Ю.  Explanatory Mensuration - Page 2by Alfred Hiley - 1879 - 188 pagesFull view - About this book
 | Edward Clarke Lowe - 1866 - 172 pages
...another, which meet together, but are not in the same straight line. 10. 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 & perpendicular... | |
 | Walter Marsham Adams - 1866 - 114 pages
...line AB, each of these angles is called a right angle, and we have this definition: •-AJ "When one straight line standing upon another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle, and the straight lines are said to be perpendicular... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...equal to the angle 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 ; [Definition 10. therefore each of the angles DCF, ECF is a right... | |
 | Robert Potts - 1868 - 434 pages
...they are drawn from the center G : therefore the angle ADG is equal to the angle GDB : (I. 8.) but when a straight line standing upon another straight...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... | |
 | Septimus Tebay - Measurement - 1868 - 168 pages
...Thus, the angle at A is contained by the two straight lines AB, AC ; and is called the angle BA C. 8. When a straight line standing upon another straight line makes the adjacent angles equal, each of them is called a right angle; and the straight line standing upon the other is called a perpendicular.... | |
 | E. M. Reynolds - Geometry - 1868 - 172 pages
...When an angle stands alone one letter only is often used, as A. 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... | |
 | Isaac Todhunter - Measurement - 1869 - 312 pages
...three times another 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... | |
 | Elias Loomis - Geometry - 1871 - 302 pages
...the angle ECD is the difiei ence 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 to it. 11. An acute angle... | |
 | William Alexander Myers - Circle-squaring - 1873 - 238 pages
...concentric circles ; *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... | |
 | Henry Major - Student teachers - 1873 - 588 pages
...line. An angle is 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... | |
| |
