| Charles James - 1805 - 1006 pagina’s
...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... | |
| David Steel - 1805
...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 Vyse - 1806 - 320 pagina’s
...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.... | |
| John Playfair - 1806 - 311 pagina’s
...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... | |
| George Adams - 1813 - 534 pagina’s
...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.** An obtuse angle is that which is greater than a right angle. A line AB, Jig. 2, plate 4, cutting another... | |
| Euclides - 1814
...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 - 346 pagina’s
...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.... | |
| William Jillard Hort - 1822
...A right angle, is that which is made by the meeting of two 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... | |
| Peter Nicholson - 1823
...oblique angles to AB ; and in the former case, fig. 6, CD is 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... | |
| Peter Nicholson - 1825 - 372 pagina’s
...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 of any thing." 14. A figure is that which is inclosed by... | |
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