 ... 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. 11. An obtuse angle...  A general view of the sciences and arts - Page 19by William Jillard Hort - 1822Full view - About this book
 | Ferdinand Rudolph Hassler - Geometry - 1828 - 180 pages
...angle, is that which is greater than a right angle. In figure 1, the angle ErfB, is an obtuse angle. 9. An acute angle, is that which is less than a right angle. In figure 1, the angle E.tfD, is an acute angle. 10 Figure, is any space terminated. (So figure 2 to... | |
 | John Playfair - Geometry - 1829 - 210 pages
...necessarily equal to one another, ED. 12. An obtuse angle is that which is greater than a right angle13. An acute angle is that which is less than a right angle. Note. An angle which is either acute or obtuse is often called an oblique angle. ED. 14. If two lines... | |
 | Thomas Curtis - Aeronautics - 1829 - 814 pages
...a PERPENDICULAR. Fig. 4. 8. An OBTUSE ANGLE is that which is greater than a right angle. Fig. 5. 9. An ACUTE ANGLE is that which is less than a right angle. 'Fig. 6. 10. PARALLEL STRAIGHT LINES are such as are in the same plane, and which being produced ever... | |
 | John Bonnycastle - Geometry - 1829 - 256 pages
...other. 10. A right angle is that which is formed by two lines that are perpendicular to each other.* 11. An acute angle is that which is less than a right angle. 12. An obtuse angle is that which is greater than a right angle. PRACTICAL GEOMETRY. 15 13. A circle... | |
 | John Bonnycastle - Measurement - 1833 - 310 pages
...A right angle is that which is formed by two line* that are perpendicular to each other.* .-. > il. An acute angle is that which is less than a right angle. 12. An obtuse angle is that which is greater than a righi angle. * Any angle differing from a right... | |
 | Euclid - 1835 - 540 pages
...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 is less than a right angle. XIII. " A term or boundary is the extremity of any thing." XIV. A figure is that which is enclosed... | |
 | Mathematics - 1836 - 488 pages
...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 less than a right angle. 10. A figure is that which is enclosed by one or more boundaries. — The word area denotes the quantity... | |
 | Charles Reiner - Geometry - 1837 - 246 pages
...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... | |
 | Edward Tagart - Logic - 1837 - 156 pages
...of two straight lines to one another, which meet together but are not in the same straight line." " An obtuse angle is that which is greater than a right angle." With what propriety can it be said that these are hypotheses? An hypothesis is that mode of accounting... | |
 | Charles Reiner - Geometry - 1837 - 254 pages
...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 each other; nor are all acute angles equal to each other. 15.... | |
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