| Alberta. Department of Education - Education - 1912 - 244 pages
...8. Prove that 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.** 8 9. (a) If a straight line be bisected and produced to any point, the rectangle contained by the whole... | |
| Great Britain. Board of Education - Education - 1912 - 1048 pages
...BC. 2. Prove that the interior angles of any rectilinear figure together with four right angles are **equal to twice as many right angles as the figure has sides.** Find the number of sides of a regular polygon, each angle of which is equal to the sum of an angle... | |
| Great Britain. Board of Education - Mathematics - 1912 - 632 pages
...BC. 2. Prove that the interior angles of any rectilinear figure together with four right angles are **equal to twice as many right angles as the figure has sides.** Find the number of sides of a regular polygon, each angle of which is equal to the sum of an angle... | |
| William Charles Popplewell - Geodesy - 1915 - 266 pages
...the number of sides. Stated precisely, " the sum of all the internal angles of a closed polygon plus **four right angles is equal to twice as many right angles as the figure has sides."** So that it is easy from the field notes to find the internal angle at each corner of the figure, and... | |
| Alfred Hubert Haines, A. F. Hood Daniel - Building - 1915 - 360 pages
...fulfilled :— 1. All the interior deduced or observed angles together with four right angles must be **equal to twice as many right angles as the figure has sides.** 2. The northings must equal the southings. 3. The eastings must equal the westings. In ordinary traverse... | |
| John Whitelaw - Surveying - 1916 - 578 pages
...measurements before leaving the ground, as " the sum of the interior angles of any rectilinear figure **is equal to twice as many right angles as the figure has sides,** less four right angles." In the case of Fig. 73, as the figure is four-sided the sum of the interior... | |
| David Wells Payne - Founding - 1917 - 724 pages
...opposite to corresponding angles are proportional. (6) In any polygon, the sum of all the interior **angles is equal to twice as many right angles as the figure has sides,** less four right angles. (7) In any polygon the sum of all the exterior angles is equal to four right... | |
| James Park - Azimuth - 1922 - 598 pages
...iii . . . . 141 12 iv .... 66 40 Total . 360° 00' And the sum of the internal angles of a polygon **is equal to twice as many right angles as the figure has sides,** less four right angles. Our figure has four sides, .-. 90(4x2) -(4x90) =360°, which agrees with the... | |
| John Whitelaw - Surveying - 1924 - 650 pages
...measurements before leaving the ground, as " the sum of the interior angles of any rectilinear figure **is equal to twice as many right angles as the figure has sides,** less four right angles." In the case of Fig. 73, as the figure is four-sided the sum of the interior... | |
| Arthur Warry Siddons, Reginald Thomas Hughes - Geometry - 1926 - 202 pages
...at O = 4 rt. L s. Th. 1, Cor. QED COR. The sum of the interior angles of any convex polygon together **with four right angles is equal to twice as many right angles as the** polygon has sides. [For the interior and exterior angles at n vertices = nx 2 rt. L a, .'. the interior... | |
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