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. The Elements of Euclid - Side 19av Euclid - 1838 - 416 siderUten tilgangsbegrensning - Om denne boken
| Edward Albert Bowser - 1890 - 420 sider
...2 rt. Zs (n — 2) = 2n rt. Zs — 4 rt. Zs. Therefore, the sum of the angles of a polygon is also equal to twice as many right angles as the figure has sides, less four right angles. 149. COR. 2. The sum of the angles of a quadrilateral is equal to two right... | |
| James Andrew Blaikie, William Thomson - 1891 - 160 sider
...interior opposite angles, and the three interior angles are together equal to two right angles. Cor. i.— All the interior angles of any rectilineal figure...twice as many right angles as the figure has sides. Cor. ii.— All the exterior angles of any rectilineal figure are together equal to four right angles.... | |
| Caleb Pamely - 1891 - 666 sider
...tested by Euclid, for, " The sum of all the interior angles of any rectilinear figure, together with 4 right angles, are equal to twice as many right angles as the figure has sides." This is not so thorough a test as the plotting, because it checks only the angles taken and not the... | |
| Thomas Baker - 1891 - 262 sider
...taking the angles or measuring the lines. But since the sum of all the interior angles of a polygon is equal to twice as many right angles as the figure has sides, lessened by four right angles, and since the given figure has five sides, the sum of all its five interior... | |
| Euclid, John Bascombe Lock - 1892 - 188 sider
...an isosceles triangle. LE 8 118. Corollary 1. All the interior angles of a closed rectilineal figwe together with four right angles are equal to twice as many right angles as the figure has sides. Let ABCDE... represent any rectilineal figure. Take a point P within the figure. Join P to each angular... | |
| Sidney Luxton Loney - 1893 - 534 sider
...regular decagon. The corollary to Eue. I. 32 states that all 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. Let the angle of a decagon contain x right angles, so that all the angles are together equal to 10#... | |
| Great Britain. Education Department. Department of Science and Art - 1894 - 894 sider
...at right angles to AD and CE at right angles to BC ; show that AE is equal to AD. (12.) 9. Show that all the interior angles of any rectilineal figure,...twice as many right angles as the figure has sides. A five sided figure has four equal angles, and the fifth angle equals a half of one of the four ; find... | |
| Queensland. Department of Public Instruction - 1897 - 446 sider
...the triangles are equal in all respects. 3. Show that all the interior angles of any rectilineal 7 figure, together with four right angles, are equal...twice as many right angles as the figure has sides. 4. Parallelograms on equal bases, and between the 18 same parallels, are equal in area. 5. The complements... | |
| George D. Pettee - 1896 - 272 sider
...[alt. int. A (||s)] POLYGONS PROPOSITION XXX 43 111. Theorem. The sum of the angles of a polygon is equal to twice as many right angles as the figure has sides, less four right angles. Appl. Cons. Dem. i> Prove A + B + C, etc. = (2 n — 4) rt. Draw diagonals... | |
| Northwest Territories Council of Public Instruction - 1897 - 628 sider
....Vttf* (\tn<thl«trs must obtain at Ittist 34 ;xr <rnf. on rack section. A. 1. (<*} Prove that nil the interior angles of any rectilineal figure, together with four right angles, are equal to twice us many right angle* as th<« figure has shies. Cor I. I 82. \ Show that proposition vii> applies to... | |
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