 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.  A course of geometrical drawing - Page 2by William Schofield Binns - 1861Full view - About this book
 | Euclides - 1846 - 292 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 (Def. 10) ; therefore CH is perpendicular to AB : Wherefore, from the given point C without it, CH... | |
 | Great Britain. Admiralty - Geometry - 1846 - 130 pages
...The extremities of a superficies are lines. VII. A plane superficies is that in which any two Ğr C angle; and the straight line which stands on the other, is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | Great Britain. Admiralty - Geometry - 1846 - 130 pages
...only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E. X. angle; and the straight line which stands on the other, is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | Euclides - 1847 - 128 pages
...Definition 18. 10. When a straight line, standing on another straight line, makes the adjacent an. gles equal to one another, each of the angles is called...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... | |
 | Euclides - 1848 - 52 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...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | Charles Richson - 1848 - 98 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 which stands on the other is called & perpendicular to it." QUESTION upon these definitions, if given. 27 II. — To draw four right (... | |
 | Euclid, Thomas Tate - 1849 - 120 pages
...one angle at a point, it may be expressed by a letter placed at that point; as the ;ingle at E." ' x. When a straight line standing on another straight...on the other is called a perpendicular — to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | Janet Taylor - Nautical astronomy - 1851 - 702 pages
...points and quarter-points of the compass, cut off from the circle by the lines which form the angle. When a straight line standing on another straight...stands on the other is called a perpendicular to it : thus the line AC is perpendicular to DB, and makes with it the two adjacent angles CAD, CAB, equal... | |
 | Euclides - 1852 - 152 pages
...shall coincide with A. Observe that DE will fall nearer to AC or EF than BA does.] B 2 BOOK I. BOOK I. When a straight line standing on another straight...stands on the other is called a perpendicular to it. [That there may be two such angles equal, may be exhibited by the following figures: DC meets the right... | |
 | Royal Military Academy, Woolwich - Mathematics - 1853 - 400 pages
...only 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...stands on the other is called a perpendicular to it. 11. An obtuse angle is that \vhich is greater than a right angle. 12. An acute angle is that which... | |
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