| David Steel - 1805
...each other. When a straight line AD standing upon another CB, makes angles ADC, ADB, on each side, **equal to one another; each of these angles is called a Right Angle; and** C J> B the line AD is said to be Perpendicular to the line CB. An angle is usually expressed by three... | |
| George Adams - 1813 - 534 páginas
...straight line AB, //<>-. 1 , plate 4, standing upon another CD, makes angles ABC, ABD, on each side **equal to one another ; each of these angles is called a right angle ; and the** line AB is said to be perpendicular to the line CD. It is usual to express an angle by three letters,... | |
| Euclid - 1822 - 179 páginas
...sides. 1 1 . When a right line standing on another makes F,-g 3. the adjacent angles (ABC and ABD) **equal to one another, each of these angles is called a right angle** ; B ~ Pig. 4Fij7. 4SeeN, Steff, \ \ _\ T" Fij-6. iff. T. Pig. 8. Fvy. 8. F/j- 9. FS.7,, fig. 10. and... | |
| George Darley - 1828 - 169 páginas
...directs their operations. LESSON II. DBF. VI. " If one right line, standing upon another, make the **adjacent angles equal to one another, each of these angles is called a right angle, and the** right line which stands upon the other is called a perpendicular to it." TEACHER. The shortest way... | |
| Euclid, Thomas Elrington - 1833 - 183 páginas
...the sides. 11. When a right line standing on another makes Fig. 3. the adjacent angles (ABC and ABD) **equal to one another, each of these angles is called a right angle** ; B and the right line, which stands on the other, is called a perpendicular to it. Fig. 1. 12. The... | |
| George Darley - 1836 - 128 páginas
...figure bounded by three right lines, ibid. DF.F. VI. If one right line, standing upon another, make the **adjacent angles equal to one another, each of these angles is called a** ri9ht angle, and the right line which stands upon the other is called a perpendicular to it, 12. DEF.... | |
| Euclides - 1846
...they are adjacent angles : But, when a straight line, standing on another straight line, makes the **adjacent angles equal to one another, each of these angles is called a right angle** (Def. 10) ; therefore each of the angles DCF, ECF is a right angle : Wherefore, from the given point... | |
| Charles Davies - 1852 - 392 páginas
...line meets another straight line, so as to make the adjacent angles equal to each other, each angle **is called a right angle ; and the first line is said to be perpendicular to** the second. 14. An ACUTE ANGLE is an angle less than a right angle. 16. Two straight lines are said... | |
| A. M. LEGENDRE - 1852
...line meets another straight line, so as to make the adjacent angles equal to each other, each angle **is called a right angle ; and the first line is said to be perpendicular to** the second. 14. An ACUTE ANGLE is an angle less than a right angle. 16. Two straight lines are said... | |
| Charles Davies - 1854 - 432 páginas
...line meets another straight line, so as to make the adjacent angles equal to each other, each angle **is called a right angle ; and the first line is said to be perpendicular to** the second. 14. An ACUTE ANGLE is an angle 1ess than a right angle. 15. An OBTUSE ANGLE is an angle... | |
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