 | John Playfair, Euclid - Circle-squaring - 1804 - 468 pages
...right angles as there are triangles b ; that is, as there are fides in the figure BCDEF ; and becaufe all the angles of the figure, .together with four right angles, are likewise equal to twice as many right angles as there are fides in the c i. cor. figure c ; therefore... | |
 | Robert Simson - Trigonometry - 1806 - 546 pages
...the common vertex of the triangles ; that is », to15. 1. gether with four right angles. Therefore all the angles of the figure, together with four right...equal to twice as many right angles as the figure has sides. CoR. 2. All the exterior angles of any rectilineal figure, are together equal to four right... | |
 | Thomas Hodson - Arithmetic - 1806 - 502 pages
...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 - Mathematics - 1806 - 320 pages
...to all the angles of the figure, together with four right angles, that is, the angles of the figure are equal to twice as many right angles as the figure has sides, wanting four. COR. 2. All the exterior angles of any rectilineal figure are together equal to... | |
 | Sir John Leslie - Geometry, Analytic - 1809 - 542 pages
...interior one AED, is equal to two right angles. All the exterior angles therefore, added to the interior angles, are 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,... | |
 | Euclid - Geometry - 1810 - 554 pages
...a side of a triangle, &c. QED CoR. 1. All the interior angles of any rectilineal figure, together D 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,... | |
 | Euclides - 1814 - 560 pages
...the same angles are equal to the angles of the figure, together with the angles at the point F, which together with four right angles, are equal to twice as many right angles as the figure has sides. Cor. 2. All the exterior angles of any rectilineal figure are together equal to four right angles.... | |
 | Euclides - 1816 - 588 pages
...is the common vertex of the triangles : that is a, together is. 1. with four right angles. Therefore all the angles of the figure, together with four right...equal to twice as many right angles as the figure has sides. Cor. 2. All the exterior angles of any rectilineal figure' are together equal to four right... | |
 | John Playfair - Circle-squaring - 1819 - 350 pages
...angles as there are triangles (32. 1.) ; that is, as there are sides in the figure BCDEF ; and because all the angles of the figure, together with four right angles, are likewise equal to twice as many right angles as there are sides in the figure (cor. 1. 32. 1.) ; therefore... | |
 | Euclid, Robert Simson - Geometry - 1821 - 514 pages
...angles. Wherefore if a side of a triangle, &c. QED COK. 1. All the interior aigles of any rectilineal figure, together with four right angles, are equal to twice as many right E' angles as the figure has sides. For any rectilineal figure ABCDE can be divided into as many triangles... | |
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F, which is the common vertex of the triangles ; that is, 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 sides. 
