| Edward Laurence - Surveying - 1716 - 408 pages
...< a, is equal to t wo right Angles (by tbe ^tb /)confequently all the internal and external Angles are equal to twice as many right Angles as the Figure has fides. But ail its internal Angles are equal to twiae as many right Angles except 4 as it has fides... | |
| Edward Wells - Arithmetic - 1723 - 358 pages
...the Sum of all the Angles in all the Tri~ angles, into which the Figure is divided, will together be equal to twice as ma-ny right Angles, as the Figure has Sides. But the Angles about P, the inward Point of each Figure, wherein all the Triangles concur, are (by... | |
| Robert Simson - Trigonometry - 1762 - 488 pages
...&c. Q^ED COR. i . All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has fides. For any rectilineal figure ABCDE can be divided into as many triangles as the figure has fides... | |
| Euclid - Geometry - 1765 - 492 pages
...taken together) therefore .all the angles of a right-lined figure, together with four right angles, are equal to twice as many right angles as the figure has fides. And taking away four right angles from each, there will remain all the angles of the figure... | |
| Thomas Malton - 1774 - 484 pages
...fubtended by the Sides. ie equal to four Right Angles. And, all the internal Angles of any Right-lined Figure are equal to twice as many Right Angles as the Figure has Sides, wanting four, (Th. i. i0. i.) confequently, the external Angles being equal to thofe four (Th. 2. of the fame) are... | |
| Robert Simson - Trigonometry - 1775 - 534 pages
...together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has fides. Becaufe every interior angle ABC,'with its adjacent exterior b i3. i. ABD, is equal b to two... | |
| Euclid - 1781 - 552 pages
...together with four right angles. Thprefpre all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has fides. CoR. 2. All the exterior angles of any rectilineal figure, arc together equal to four right... | |
| John McGregor (teacher of mathematics.) - Mathematics - 1792 - 532 pages
...ft, I. 32. Euclid. All the anterior angles of any reoilineal figure, together with four right angles, are equal to twice as many right angles as the figure has fides. Hence the following rule. RULE. From double the number of fides fubtraft 4, and the remainder... | |
| Alexander Ingram - Trigonometry - 1799 - 374 pages
...AB BC E> CoR. i. All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has fides. For For any rectilineal figure ABCDE can be divided into as many triangles as the figure has... | |
| Mathematics - 1801 - 658 pages
...work ; add all the inward angles A, B, C, Sec. together, and when the work is right, their sum will he equal to twice as many right angles, as the figure has sides, wanting four right angles. And when there is an angle, as F, that bends inward, and you measure the external angle, which is less... | |
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