 | Euclides - Euclid's Elements - 1881 - 236 pages
...(Ax. 1) to two right angles. Wherefore, if a side of any triangle be produced, &c. a ED COR. 1. — All the interior angles of any rectilineal figure...twice as many right angles as the figure has sides. Let ABCDE be any rectilineal figure. All the interior angles ABC, BCD, &c. together with four right... | |
 | Thomas Holloway (surveyor.) - 1881 - 132 pages
...four-sided rectilineal figure is equal to four right angles or three hundred and sixty degrees. 3. All the interior angles of any rectilineal figure,...twice as many right angles as the figure has sides. Although further systems of proof could easily be quoted, I consider the foregoing quite sufficient... | |
 | Education, Higher - 1881 - 504 pages
...to the hypotenuse and one side of the other, the triangles are equal in every respect. 4 The sum of the interior angles of any rectilineal figure together with four right angles, equals twice as many right angles as the figure has sides. 5. Equal triangles upon equal bases in the... | |
 | Education, Higher - 1882 - 498 pages
...and the side opposite to the equal .es also equal, the triangles must be equal in every respect. 4 All the interior angles of any rectilineal figure...twice as many right angles as the figure has sides. 5. Equal triangles upon equal bases in the same straight line and towards the same parts are between... | |
 | 1882 - 486 pages
...is 60°, or 66* 66' 66"-6. In corollaries to the same proposition it is shown that all the internal angles of any rectilineal figure, together with four...twice as many right angles as the figure has sides ; also, that all the external angles of any rectilineal figure formed by producing the sides in the... | |
 | 1882 - 376 pages
...triangle are equal to two right angles; and that all the interior angles of any rectilineal n'gure, together with four right angles, are equal to twice as many right angles as the figure has sides. 3. If the square described upon one of the sides of a triangle is equal to the squares described upon... | |
 | Marianne Nops - 1882 - 278 pages
...two-thirds of a right angle or 60°. III. All the interior angles of any rectilineal figure added to four right angles are equal to twice as many right angles as the figure has sides. Now, any figure can be divided into as many triangles as it has sides by drawing lines from each of... | |
 | Joseph Hughes - Education - 1883 - 568 pages
...read out by the Inspector. Euclid. [AH generally understood abbreviations for words may be used.] 1. All the interior angles of any rectilineal figure...twice as many right angles as the figure has sides. See Corollary to Euclid I. 32. If the figure be equiangular and four interior angles be equal to seven... | |
 | Moffatt and Paige - 1883 - 516 pages
...are equal to two right angles (Ax. 1). Therefore, if a side of any triangle be produced, etc. COR. 1. All the interior angles of any rectilineal figure,...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... | |
 | Education - 1883 - 654 pages
...the passage read out by Euclid. [All generally understood abbreviations for irorJs may be used.] 1. All the interior angles of any rectilineal figure...twice as many right angles as the figure has sides. See Corollary to Euclid I. 32. If the figure be equiangular and four interior angles be e ]ual to seven... | |
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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. 
