| John Henry Robson - 1880 - 118 pages
...proved 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."** If, therefore, we suppose the polygon to have n sides, All its interior angles + 4.90 .= 272.90 . -.... | |
| Sir Norman Lockyer - Electronic journals - 1880 - 668 pages
...Theorem XXVI. of the syllabus, that the interior angles of any polygon, together with four right angles, **are equal to twice as many right angles as the figure has sides.** In the new notation we would say that the sum of the interior angles of the polygon is equal to a number... | |
| Oxford univ, local exams - 1880 - 394 pages
...in a circle. 2. 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.** 3. If the square described on one side of a triangle be equal to the squares described on the other... | |
| William Frothingham Bradbury - Geometry - 1880 - 260 pages
...minus two. Let ABCDEF be the given polygon ; the sum of all the interior angles A, B, C, D, E, F, is **equal to twice as many right angles as the figure has sides** minus two. For if from any vertex A, diagonals AC, AD, AE, are drawn, the polygon will be divided into... | |
| William Mitchell Gillespie - Surveying - 1880 - 570 pages
...proposition of Geometry, that in any figure bounded by straight lines, the sum of all the interior angles is **equal to twice as many right angles, as the figure has sides** less two ; since the figure can be divided into that number of triangles. Hence this common rule. "... | |
| Isaac Todhunter - Euclid's Elements - 1880 - 426 pages
...<JE». COROLLARY 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** side*. For any rectilineal figure ABCDE can be divided into as many triangles as the figure has sides,... | |
| Thomas Newton Andrews - Geometry - 1881 - 168 pages
...is proved 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."** If we have to describe a pentagon on the base AB, we must first calculate the angles at the base. Thus... | |
| Thomas Holloway (surveyor.) - 1881 - 132 pages
...sixty degrees. 3. 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.** Although further systems of proof could easily be quoted, I consider the foregoing quite sufficient... | |
| John Gibson - 1881 - 302 pages
...opposite to it. 3. 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.** 4. Describe a parallelogram that shall be equal to a given triangle BCD, and have one of its angles... | |
| 1882 - 480 pages
...it is shown that all the internal angles of any rectilineal figure, together with four right angles, **are equal to 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... | |
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