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. Descriptive Astronomy - Page 795by George Frederick Chambers - 1867 - 816 pagesFull view - About this book
| John Playfair - 1806 - 320 pages
...angle at a point, it may be expressed ' by a letter placed at that point ; as the angle at E.' VII. **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... | |
| John Mason Good - 1813 - 714 pages
...two straight lines to or.e 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 the angles is called a right angle; and the straight line which stands on the... | |
| Euclides - 1814 - 560 pages
...one angle at a point, it may be ex' pressed by a letter placed at that point; as the angle at E.' X. **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... | |
| John Playfair - 1819 - 354 pages
...one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' VII. **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... | |
| Pierre Simon marquis de Laplace, Thomas Young - 1821 - 402 pages
...described by three letters placed near the lilies, the middle letter at the angular point % 64. DEFINITION. **When a straight line standing on another straight line makes the adjacent angles equal,** they are called right angles. 65. DEFINITION. A straight line between two right angles is called a... | |
| Adrien Marie Legendre - 1822 - 394 pages
...When a straight line AB meets another straight line CD, so as to make the adjacent angles BAC, BAD **equal to each other, each of those angles is called a right angle** ; and the line AB is said to be perpendicular to c CD. XI. Every angle BAC, less than D\ a right angle,... | |
| Peter Nicholson - 1825 - 1046 pages
...one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' 10. **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... | |
| Robert Simson - 1827 - 546 pages
...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 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... | |
| John Playfair - 1829 - 210 pages
...one angle at a point, it may be expressed by a letter placed at that point, as -the angle at E. 10. **When a straight line standing on another straight...makes the adjacent angles equal to each other, each of** the angles is called a right angle; and the straight line which stands on the other is called a perpendicular... | |
| Thomas Curtis - 1829 - 814 pages
...that form the angle, thus С ü D or D В С denotes the angle contained by the line С В and DB. 7. **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... | |
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