 | 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... | |
 | Euclid - 1781 - 552 pages
...angle ; and the ftraight line which ftands on the other is called a perpendicular to it. XI. An obtufe angle is that which is greater than a right angle. ,. An acute angle is that which is lefs than a right angle. > '.'XIII. , •i. ;. " A term or boundary is the extremity of any thing."... | |
 | 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... | |
 | 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... | |
 | 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... | |
 | George Adams - Geometry - 1813 - 576 pages
...three letters, that placed at the angular point being always in the middle ; as B is the angle of ABC. An obtuse angle is that which is greater than a right...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,... | |
 | 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,... | |
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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... 
