| Edward Wells - Arithmetic - 1714 - 292 pages
...th«i Sum of all the Angles in all the Tri* angles, into which the Figure is divided, will together **be equal to twice as many right Angles, as the Figure has** Sidesj But the Angles about P, the inward Point of each Figure, wherein all fhe Triangles concur, are... | |
| Edward Wells - Arithmetic - 1723 - 294 pages
...Right-, 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... | |
| Euclid - Geometry - 1765 - 464 pages
...is, has fides. But fince all the inward angles together, with four right angles, has been proved to **be equal to twice as many right angles as the figure has** fides ; therefore all the inward angles, together with four right angles, is equal to all the inward... | |
| Thomas Malton - 1774 - 440 pages
...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)... | |
| Charles Hutton - Measurement - 1788 - 703 pages
...prove the work ; add all the inward angles A, B, c, &c, together, and when the work is right, their fum **will be equal to twice as many right angles as the figure has** fides, wanting 4 right angles. And when there is an angle, as F, that bends inwards, and you meafure... | |
| Mathematics - 1801 - 426 pages
...measure the distance FA. To To: prove the work ;• add all the inward angles A, B, C, &c. together, and **when the work is right, their sum will be equal to...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... | |
| Thomas Hodson - Arithmetic - 1806 - 458 pages
...prove the work ; — add all the inward angles ABC, &c. together ; and if the work be right, the fum **will be equal to twice as many right angles as the figure has** fides, except four right angles ; but when there is an angle that bends inwards, as at F, and you meafure... | |
| John Playfair - Trigonometry - 1806 - 311 pages
...many right angles as the figure has sides, wanting four. For all the angles exterior and interior are **equal to twice as many right angles as the figure has sides,** and the exterior are equal to four right angles ; therefore the interior are equal to twice as many... | |
| Euclid, Robert Simson - Euclid's Elements - 1806 - 518 pages
...D, CoR. 1 . 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 sides.** For any rectilineal figure ABCDE can be divided into as many triangles as the figure has sides, by... | |
| Sir John Leslie - Geometry, Analytic - 1809 - 493 pages
...is equal to two right angles. All the exterior angles therefore, added to the interior angles, ftre **equal to twice as many right angles as the figure has sides.** Consequently the exterior angles are equal to the four right angles which, by the last Proposition,... | |
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