 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.  Pure mathematics - Page 103by Edward Atkins - 1874Full view - About this book
 | Thomas Curtis - Aeronautics - 1829 - 814 pages
...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...which stands on the other is called a PERPENDICULAR. Fig. 4. 8. An OBTUSE ANGLE is that which is greater than a right angle. Fig. 5. 9. An ACUTE ANGLE is... | |
 | John Playfair - Geometry - 1829 - 210 pages
...When a straight line standing on another straight line 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. Otherwise. When a straight line standing on another straight line does not incline to either side of... | |
 | James Charlton - Geography - 1829 - 250 pages
....,; . l 5tn"A f itei,*& i theinc!ination or opening -of two angles is called a RIGHT ANGLE ; and the line which stands on the other, is called a PERPENDICULAR to it. •• • > i •••••• i OF THE TERRESTRIAL •'CLdME.'"' 28. The TERRESTRIAL GLOBE is an... | |
 | Thomas Perronet Thompson - Euclid's Elements - 1833 - 168 pages
...always the direct angle that is meant. XXXVII. When a straight line standing on another straight line makes the adjacent angles equal to one another, each...stands on the other is called a perpendicular to it ; and is also said to be at right angles to it. XXXVIII. An angle greater than a right angle, is called... | |
 | Euclid - Euclid's Elements - 1833 - 216 pages
...(ABC and ABD) equal to one another, each of these angles is called a right angle ; B and the right line, which stands on the other, is called a perpendicular to it. Fig. 1. 12. The angle (ABC), which is greater than a right angle, is called obtuse. Fig. 4. 13. The... | |
 | Euclid - 1835 - 540 pages
...angle ADG is equal0 to the angle GDB : 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 :d Therefore the angle GDB is a right angle: But FDB is likewise a right angle; wherefore... | |
 | Mathematics - 1836 - 488 pages
...together but are not in the same straight line. 7. When a straight line standing on another straight line makes the adjacent angles equal to one another, each...stands on the other is called a perpendicular to it. 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is... | |
 | John Playfair - Euclid's Elements - 1836 - 488 pages
...a straight line standing on another straight line makes the adjacent angles equal to one an, other, each of the angles is called a right angle; and the straight line which stands on the other ie called a perpendicular to it. , VIII. An obtuse angle is that which is greater than a right angle.... | |
 | John Playfair - Geometry - 1836 - 148 pages
...ADG is equal (7. 1.) to the angle BDG ; 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 (Def. 27. 1.); therefore BDG is a right angle ; but BDF is likewise a right angle ; wherefore... | |
 | Euclid, James Thomson - Geometry - 1837 - 410 pages
...lines meet is called the vertex of the angle. 8. When a straight line standing on another straight line makes the adjacent angles equal to one another, each...stands on the other is called a perpendicular to it, and is said to be at right angles to it. 9. An obtuse angle is that / which is greater than a right... | |
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