 | Euclides - 1814 - 560 pagina’s
...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 is less than a right angle. Xlll. " A term or boundary is th$ extremity of any thing." XIV. A figure is that which is inclosed... | |
 | John Gummere - 1814 - 398 pagina’s
...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 pagina’s
...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 pagina’s
...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 Playfair - 1819 - 350 pagina’s
...right angle ; and the straight line which stands on the other is called a perpendicular to it. VIII. An obtuse angle is that which is greater than a right...acute angle is that which is less than a right angle. X. A figure is that which is inclosed by one or more boundaries. — Thr word area denotes the quantity... | |
 | William Jillard Hort - 1822 - 308 pagina’s
...right lines perpendicular to each other. 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 figure is that which is inclosed by one or more boundaries. A circle is a plane figure, bounded by... | |
 | Peter Nicholson - 1823 - 210 pagina’s
...said to stand at right angles to AB. 10. An ACUTE ANGLE is that which is less than a right angle. 11. An OBTUSE ANGLE is that which is greater than a right angle. In fig. 7, as CD makes the angles on each side of it unequal, one of them must be greater than the... | |
 | Peter Nicholson - 1825 - 1046 pagina’s
...right angle ; and the straight line which 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 less than a right angle. 13. " A term or boundary is the extremity... | |
 | Euclid - 1826 - 234 pagina’s
...equal angles is a right angle, and the right line standing on the other is called a perpendicular. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term is the extremity of any thing.... | |
 | George Lees - 1826 - 276 pagina’s
...less than a right angle, and, consequently^ the two are together equal to two right angles. VJII. — An obtuse angle is that which is greater than a right angle. Book I. IX. An acute angle is that which is less than a right angle. X.— A figure 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. 11. An obtuse angle... 
