 | John Ward - Mathematics - 1747 - 492 pages
...is, AC, and C J5, are Perpendicular to £> C, as well as -D, C is to /•j'r/W or both of them. g. An OBTUSE ANGLE is that which is greater than a Right Angle. Such is the Angle included between the Lines AC and n CB. 10. An ACUTE ANGLE is that ^_ which is lefs... | |
 | John Playfair - Mathematics - 1806 - 320 pages
...and the straight line which 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 is that which is less than a right angle. X. A figure is that which is inclosed... | |
 | Charles Vyse - Arithmetic - 1806 - 342 pages
...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... | |
 | Robert Simson - Trigonometry - 1806 - 546 pages
...right 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 is less than a right anp-Ic. • XIII. rt A term or boundary is the... | |
 | George Adams - Geometry - 1813 - 648 pages
...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 - Surveying - 1814 - 398 pages
...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 - Arithmetic - 1815 - 340 pages
...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 pages
...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 - Circle-squaring - 1819 - 350 pages
...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 angle. An acute angle is that which is less than a right angle. X. A figure is that which is inclosed by one... | |
 | William Jillard Hort - 1822 - 308 pages
...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... | |
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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... 
