 ... 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...  A general view of the sciences and arts - Page 19by William Jillard Hort - 1822Full view - About this book
 | 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... | |
 | Proclus (Diadochus.) - 1788 - 350 pages
...and the infifting Right Line, is called a PERPENDICULAR to that upon which it ftands. DEFINITION Xf. An OBTUSE ANGLE is that which is greater than a RIGHT ANGLE. DEFINITION XII. But an ACUTE ANGLE, is that which is Icfs than a RIGHT ANGLE, THESE are the triple... | |
 | David Steel - 1805 - 392 pages
...is the angle of ABC. " I An (tht use Angle is that which is greater than a right A ' angle, as ABC. An Acute Angle is that which is less than a right angle, asDBC. By an ANGLE of ELEVATION is meant the angle contained between a line of direction, and any plane... | |
 | Charles James - English language - 1805 - 1236 pages
...side, and consequently the arches intercepted either way are equal to 90°, or the quarter of a circle. An Acute ANGLE, is that which is less than a right angle, or 90°. An Obtuse ANCLE, is that whicb is greater than a right angle. Adjacent ANGLES, are such as... | |
 | 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... | |
 | John Playfair - Mathematics - 1806 - 320 pages
...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 by one or more boundaries. XL A circle is a plane figure contained... | |
 | Charles Vyse - Arithmetic - 1806 - 342 pages
...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 or Surface, is an Extension of two Dimensions, viz. Length and Breadth.... | |
 | George Adams - Geometry - 1813 - 648 pages
...letters, -that placed at the angular point being always in the middle ; as B is the angle of AB C. An acute angle is that which is less than a right...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,... | |
 | George Adams - Geometry - 1813 - 576 pages
...the middle ; as B is the angle of ABC. An obtuse angle is that which is greater than a right angle. An acute angle is that which is less 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
...ADC and B'DE are called right angles, and the line CD is said to be 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.... | |
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