| Audun Holme - Mathematics - 2002 - 408 pages
...the angle are straight, the angle is caller rectilinear. 9. When a straight line set up on a straight **line makes the adjacent angles equal to one another, each of the angles is** right, and the straight line standing on the other is called the perpendicular to the one on which... | |
| Jean Christianidis - Mathematics - 2004 - 502 pages
...perpendicular to AT and Definition I.10, which states that “When a straight line set up on a straight **line makes the adjacent angles equal to one another, each of the** right angles is right, and the straight line standing on the other is called a perpendicular to that... | |
| Paolo Mancosu, Klaus Frovin Jørgensen, Stig Andur Pedersen - Mathematics - 2005 - 336 pages
...of (rectilinear) angles (trans. Heath 1926, I, 181): 1 0. When a straight line set up on a straight **line makes the adjacent angles equal to one another, each of the** equal angles is right [...]. 1 1 . An obtuse angle is an angle greater than a right angle. 12. An acute... | |
| Peter M. Engelfriet - Mathematics - 1998 - 516 pages
...is not necessary to define a rectilineal angle). 10. SJt When a straight line set up on a straight **line makes the adjacent angles equal to one another, each of the** equal angles is right, and the straight line standing on the other is called a perpendicular to that... | |
| Euclid - 452 pages
...therefore the angle AFE is equal to the angle BFE. [i. 8] But, when a straight line set up on a straight **line makes the adjacent angles equal to one another, each of the** equal angles is right ; [i. Def. 10] 20 therefore each of the angles AFE, BFE is right. Therefore CD,... | |
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