 | Adrien Marie Legendre - Geometry - 1838 - 382 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 these angles is called a right angle ; and the line AB is said to be perpendicular to CD. e A 11. Every angle BAC, less than a1 right angle, is an... | |
 | Charles Davies - Surveying - 1839 - 376 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 these angles is called a right angle; and the line AB is said to be perpendicular to CD. 11. Every angle BAC, less than a right angle, is an acute... | |
 | Charles Davies - Surveying - 1839 - 376 pages
...When a straight line AB meets another straight line CD, so as to make the adjacent angles BAG, BAD, equal to each other, each of these angles is called a right angle; and the line AB is said to be perpendicular to CD. 11. Every angle BAC, less than a right angle, is an acute... | |
 | Euclides - 1840 - 192 pages
...angles.] 7. When a straight line, standing on another straight line, makes with it the adjacent angles equal to each other, each of these angles is called a RIGHT ANGLE ; and each of the lines is said to be at right angles with, or to be perpendicular, or a PERPENDICULAR, to... | |
 | Charles Davies - Navigation - 1835 - 388 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 these angles is called a right angle ; and the line AB is said to be perpendicular to CD. 11. Every angle BAC, less than a right angle, is an acute... | |
 | Nicholas Tillinghast - Geometry, Plane - 1844 - 110 pages
...straight line, as AB, meets another straight line, as CD, so as to make the adjacent angles, CAB, BAD, equal to each other, each of these angles is called a right angle, and the line AB is said to be perpendicular to CD. 7. Every angle less than a right angle is called an acute... | |
 | Euclides - 1845 - 546 pages
...the angle at /.'. 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 ; and the straight line which stands on the other is called a perpendicular to it. XI. An obtuse angle is that... | |
 | Euclides - 1848 - 52 pages
...straight line. X. 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 ; and the straight line which stands on the other is called a perpendicular to it. XI. An obtuse angle is that... | |
 | Charles Richson - 1848 - 98 pages
...straight line." 2. "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; and the straight line which stands on the other is called & perpendicular to it." QUESTION upon these definitions,... | |
 | Charles Davies - Trigonometry - 1849 - 372 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 these angles is called a right angle ; and the line AB is said to be perpendicular to CD. = 11. Every angle BAC, less than a 1 right angle, is an... | |
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Two straight lines are said to be parallel, when being situated in the same plane, they cannot meet, how far soever, either way, both of them be produced. 
