 The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles.  Elements of Geometry - Page 12by Andrew Wheeler Phillips, Irving Fisher - 1897 - 354 pagesFull view - About this book
 | Moffatt and Paige - 1879 - 428 pages
...perpendicular CH has been drawn to the given straight line A B. QEF Proposition XIII. Theorem. The angles which one straight line makes with another upon one side of it are either two right angles or are together equal to two right angles. Let the straight line AB make with... | |
 | W J. Dickinson - Geometry - 1879 - 44 pages
...the perpendicular front the vertex on the base bisect the base, the triangle is isosceles. 13. The angles which one straight line makes with another upon one side of it are either two right angles, or are together equal to two right angles. Same proposition. If the angles... | |
 | Noah Knowles Davis - Logic - 1880 - 344 pages
...angles will bo equal. For the angles CEA and AED are together equal to two right angles, since the angles which one straight line makes with another...side of it are together equal to two right angles ; and the angles AED and DEB are together equal to two right angles for the same reason; therefore... | |
 | Pupil teachers - 1880 - 1486 pages
...triangle the perpendicular from the vertex on the base bisect the base, the triangle is isosceles. 18. The angles which one straight line makes with another upon one side of it are either two right angles, or are together equal to two right angles. Same proposition. If the angles... | |
 | 1880 - 594 pages
...angles. Why is the equilateral triangle described on the side remote from the given angle ? 2. The angles which one straight line makes with another upon one side of it are either two right angles, or are together equal to two right angles. Why is this proposition a theorem... | |
 | Euclides, Frederick Burn Harvey - Geometry - 1880 - 178 pages
...that the angle DAC = the angle BAC, arid that the angle BCA = the angle DCA. PROP. XIII. THEOREM. The angles which one straight line makes with another upon one side of it are either two right angles, or are together equal to two right angles. CASE I. — When the angles are... | |
 | Simon Newcomb - Geometry - 1881 - 418 pages
...general definition of the sum of two angles, and adhered to it, his thirteenth proposition, that the angles which one straight line makes with another...side of it are together equal to two right angles, would have been unnecessary. The reason of placing it in this category is simply that the idea of a... | |
 | Moffatt and Paige - 1881 - 176 pages
..., x .] 1. To bisect a given rectilineal angle, that is, to divide it into two equal angles. 2. The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Why is this proposition a theorem... | |
 | Free Church of Scotland. College Committee - Theological seminaries - 1882 - 142 pages
...EUCLID, Books I., II. ; ALGEBRA, as far as SIMPLE EQUATIONS Examiner— Rev. JAMES MATTHEW, BD 1. The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. 2. If a side of any triangle be... | |
 | Education - 1882 - 676 pages
...base, equal to one another, and likewise those which are terminated in the other extremity. 2. The angles which one straight line makes with another upon one side of it are either two right angles, or are together equal to two nght angles. The lines bisecting an internal,... | |
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