| George Lees - 1826 - 207 pągines
...two right angles. VJII. — An obtuse angle is that which is greater than a right angle. Book I. IX. **An acute angle is that which is less than a right angle.** X.— A figure is that which is inclosed by one or more boundaries. XL Figures are said to be equivalent,... | |
| Euclid, Phillips - 1826 - 180 pągines
...other is called a perpendicular. 11. An obtuse angle is that which is greater than a right angle. 12. **An acute angle is that which is less than a right angle.** 13. A term is the extremity of any thing. 14. A figure is that which is contained under one or more... | |
| Robert Simson - 1827 - 513 pągines
...called a perpendicular to it. XL 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... | |
| Ferdinand Rudolph Hassler - 1828 - 159 pągines
...obtuse 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... | |
| Thomas Curtis - 1829
...called 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 - 1829 - 252 pągines
...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 Playfair - 1829 - 186 pągines
...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... | |
| John Bonnycastle - 1833 - 288 pągines
...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... | |
| Euclides - 1834
...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 by one or more boundaries.** XV. A circle is a plane figure contained by one line, which is called the circumference, and is such,... | |
| Euclid, Robert Simson - 1835 - 513 pągines
...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... | |
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