| Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 428 pages
...angle AFE is equal to the angle BFE. [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 each of the angles AFE, BFE is a right angle. Therefore the straight... | |
| Euclides - 1883 - 176 pages
...L DCF = L ECF, and these 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.** .-. CF is at right angles to AB, and is drawn from the given point CQEF NSte.— Since an angle may... | |
| Stewart W. and co - 1884 - 272 pages
...named from three or one letters, as ABC or B. X. When a straight line standing on another straight **line makes the adjacent angles equal to one another,...and the straight line which stands on the other is** _ called a perpendicular to it. XI. An obtuse angle is greater than a right angle. XII. An acute angle... | |
| Euclides - 1884 - 434 pages
...a straight line stands on another straight line, and makes the adjacent angles equal to each other, **each of the angles is called a right angle ; and the...stands on the other is called a perpendicular to it.** CUD Thus, if AB stands on CD in such a manner that the adjacent angles ABC, ABD are equal to one another,... | |
| Euclides - 1884 - 214 pages
...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...stands on the other is called a perpendicular to it.** PROPOSITION XIII. THEOREM. The angles which one straight line makes with another straight line on one... | |
| Euclides - 1884 - 182 pages
...line standing on another straight line makes the adjacent angles equal to each other, each of these **angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it.** 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is... | |
| 1884 - 434 pages
...bine 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...stands on the other is called a perpendicular to it."** Let us then take two sets of such lines and apply one to tjie other, so that the feet of the perpendiculars... | |
| American periodicals - 1884 - 862 pages
...same straight line [plane]. X. When a straight line [plane] standing on another straight line [plane] **makes the adjacent angles equal to one another, each of the angles is called a right angle** [right dihedral angle]. XV. A circle [cone of revolution with vertex at the eye] is a figure contained... | |
| Mathematics - 1885 - 150 pages
...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...stands on the other is called a perpendicular to it."** Let us then take two sets of such lines and apply one to the other, so that the feet of the perpendiculars... | |
| Joseph Ray - Arithmetic - 1885 - 358 pages
...stands on another so that it makes with it two equal angles, each of Right angle. Hisht these angles is **a RIGHT ANGLE; and the straight line which stands on the other is** said to be PERPENDICULAR to it, or at RIGHT ANGLES to it. A/ obt«se /Acute 3. An OBTUSE ANGLE is greater... | |
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