 | John Playfair - 1806 - 320 sider
...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...stands on the other is called a perpendicular to it. _____ VIII, Book I. An obtuse angle is that which is greater than a right angle. IX. An acute angle... | |
 | Robert Simson - 1806 - 546 sider
...the angle at E.' X. When a straight line standing on another straight lii>e makes the adjacent angles equal to one another, each of the angles is called...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 Vyse - 1806 - 342 sider
...placed at the Angular Point being always wrote in the Middle, as ADC (Fig. 4. denotes the Angle I. An Obtuse Angle is that which is greater than a right Angle, as CAB, (Fig 3.; An acute Angle is that which is less than a right Angle, »s DCB, (Fig. 4.) A Superficies... | |
 | John Mason Good - 1813 - 714 sider
...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...other is called a perpendicular to it. 11. An obtuse an¿le is that which is greater 'than a right angle. IS. An acnte angle is that which is less than... | |
 | George Adams - 1813 - 648 sider
...in the middle ; as B is the angle of AB C. An acute angle is that which is less than a right angle. An obtuse angle is that which is greater than a right angle. A line AB, Jig. 2, plate 4, cutting another line CD in E, will make the opposite angles equal, namely,... | |
 | John Gummere - 1814 - 398 sider
...perpendicular to AB, Fig. 4. 10. An acute angle is that which is less than a right angle, as BDE, Fig. 4. 11. An obtuse angle is that which is greater than a right angle, as ADE, Fig. 4. 13. Parallel straight lines are such as are in the same plane, and which, being produced... | |
 | Charles Vyse - 1815 - 340 sider
...placed at the angular point being always wrote in the middle, as A DC (Fig. 4.) denotes the angle b. An obtuse angle is that which is greater than a right angle, as CAB (Fig. 3.). An acute angle is that which is Iess than a right angle, as DCB(Fig.4.). Parallel... | |
 | Encyclopaedia Perthensis - 1816 - 772 sider
...RIGHT Ax OLE and the ftraight line which (lands on the other ii 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 that which is left than a right angle. F,:g. 6. 10. PARALLEL STRAIGHT... | |
 | John Gummere - 1817 - 384 sider
...perpendicular to AB, Fig. 4. \ 10. An acute angle is that which is less than a rigjit an gle, as BDE, Fig. 411. An obtuse angle is that which is greater than a right angle, as A p E, Fig. 4. 12. Parallel straight lines are those which are in the same plane, and which., being... | |
 | John Playfair - 1819 - 354 sider
...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...stands on the other is called a perpendicular to it. VIII. An obtuse angle is that which is greater than a right angle. An acute angle is that which is... | |
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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. 
