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. A course of practical geometry for mechanics - Page 9by William Pease - 1843 - 68 pagesFull 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... | |
| Robert Simson - Trigonometry - 1762 - 488 pages
...and the ltraight 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. XII. An acute angle is that which is** lefs than a right angle. XIII. " A term or boundary, is the extremity of any thing." XIV. A figure... | |
| Robert Simson - Trigonometry - 1775 - 534 pages
...and the ftraight line which flands on the other is called a perpendicular to it. — XI. An obtufe **angle is that which is greater than a right angle. XII. An acute angle is that which is** lefs than a right angle. xin. " A term or boundary is the extremity of any thing." XIV. A figure is... | |
| 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... | |
| Alexander Ingram - Trigonometry - 1799 - 374 pages
...angle ; and the ftraight line which ftands on the other is called a perpendicular to it. XI. An oUufe **angle is that which is greater than a right angle. XII. An acute angle is that which is** lefs than a right angle. XIII. Omitted. XIV. A figure is that which is inclofed by one or more boundaries.... | |
| Robert Simson - Trigonometry - 1804 - 530 pages
...ftraight line which ftands on the other is called a .perpendicular to it. / XI. An obtufe angle js **that which is greater than a right angle. XII. An acute angle is that which is** lefs than a right angle. XIII. " A term or boundary, is the extremity of any thing." XIV. A figure... | |
| 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
...called a 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...An acute angle is that which is less than a right** anp-Ic. • XIII. rt A term or boundary is the extremity of any thing." XIV. A figure is that which... | |
| 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... | |
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