 | David Steel - 1805 - 392 pages
...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 - Geometry - 1813 - 576 pages
...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 - 222 pages
...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 - Geometry - 1828 - 190 pages
...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 - Euclid's Elements - 1833 - 216 pages
...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 - Euclid's Elements - 1836 - 172 pages
...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 - 292 pages
...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 - Navigation - 1852 - 412 pages
...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... | |
 | Adrien Marie Legendre - Geometry - 1852 - 436 pages
...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 - Geometry - 1854 - 436 pages
...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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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 ; and the straight line which stands on the other is called a perpendicular to it. 
