 | Euclides - 1865 - 402 sider
...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. (References— Prop. I. 11; ax. 1, 2; def. 10.) Let the straight line AB make with CD, upon one side... | |
 | William Harris Johnston - 1865 - 478 sider
...another upon one tide of it, as the angles с Ъ d and а Ъ d, or abe and с Ь e, in the figure above, are either two right angles, or are together equal to two right angles. An angle greater than a right angle is called an obtuse angle. An angle less than a right angle is... | |
 | John Playfair - 1855 - 350 sider
...Let the straight line AB make with CD, upon one side of it the angle* CBA, ABD ; these are eithertwo right angles, or are together equal to two right angles....if the angle CBA be equal to ABD, each of them is a rtght angle (I)ef. 7.) ; but, if not, from the point B draw BE at rtght angles (11. 1.) DB 0 I> BC... | |
 | James Fraser (bp. of Manchester.) - 1866 - 480 sider
...corollaries to the proposition : 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. 3. Prove that the angles at the base of an isosceles triangle are equal. 4. Prove that if, from a point... | |
 | Euclid, Isaac Todhunter - 1867 - 424 sider
...straight line AB make with the straight line CD, on one side of it, the angles CBA, ABD : these either are two right angles, or are together equal to two right angles. For if the angle CBA is equal to the angle ABD, each of them is a right angle. [Definition 10. But if not, from the point... | |
 | Euclid, Isaac Todhunter - 1867 - 426 sider
...right For if the angle CBA is equal to the angle ABD, each of them is a right angle. [Definition 10. But if not, from the point B draw BE at right angles to CD; [I. 11. therefore the angles CBE, EBD are two right angles.[ZV/.10. Nowthe angle CBEis equal... | |
 | Robert Potts - 1868 - 434 sider
...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 CD, upon one side of it, the angles CBA, ABD. Then these shall be... | |
 | 1868 - 876 sider
...base shall be equal 30 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 angels 20 3. Any two sides of a triangle are together greater than the third side 20 4. In obtuse-angled... | |
 | Alfred Challice Johnson - 1871 - 178 sider
...versa. (Eue. L, 5, б.) 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, or 180°. (Eue. I., 13.) 3. If two straight l1nes cut one another, the vertical or opposite angles... | |
 | Henry Major - 1873 - 588 sider
...straight line AB. XIII. — The angles which one straight line makes with another upon the one side of it are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one jlide of it, the angles CBA, ABD : these are either... | |
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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 CD, upon one side of it the angles CBA, ABD ; these are either two right... 
