 | Charles Reiner - 1837 - 246 σελίδες
...each other, each of them is called a right angle. 11. All right angles are equal to each other. 12. An obtuse angle is that which is greater than a right angle. 13. An acute angle is that which is less than a right angle. 14. All obtuse angles are not equal to... | |
 | Euclides - 1838 - 264 σελίδες
...the angle at E.VIII. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight lines are said to be perpendicular to each other. IX. An obtuse angle is that which is greater than... | |
 | John Clark (drawing master.) - 1840 - 208 σελίδες
...by the number of degrees which it contains, or its proportion of the circum-c ference of a circle. An Obtuse Angle is that which is greater than a right angle, thus, An Acute Angle is that which is less than a right angle, thus, The Equilateral Triangle is a... | |
 | Euclides - 1841 - 378 σελίδες
...' angle at E." X. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. XI. XII. An acute angle is that which is less ^\ than a right angle. X>. XIII. " A term or boundary... | |
 | Euclides - 1842 - 316 σελίδες
...the angle at E.' X. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | John Playfair - 1842 - 332 σελίδες
...the 'angle at E.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other, is called a perpendicular to it 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is... | |
 | William Pease - 1843 - 80 σελίδες
...great circles. X. When a straight line standing on another straight line, makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. Beginners are apt to suppose that a perpendicular, must be a vertical, or plumb line, which it need... | |
 | Philip Kelland - 1843 - 168 σελίδες
...trigonometers often make it. 7. When a straight line standing on another makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. By looking over the propositions of Euclid's first Book it will be seen that the only definitions which... | |
 | Euclides - 1845 - 546 σελίδες
...line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
 | Euclid - 1845 - 218 σελίδες
...angle ' at E.' X. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight tine which stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is... | |
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When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it. 
