 | Robert Simson - Trigonometry - 1762 - 488 pages
...letter placed at that point; as the angle ' at E.' X. When a ftraight line ftanding on another ftrailrht line makes the adjacent angles equal to one another,...each of the angles is called a right angle; and the ltraight line which ftands on the other is called a perpendicular to it. • XI. An obtufe angle is... | |
 | Joseph Fenn - Mathematics - 1769 - 536 pages
...When a ftraight line (AB) {landing on another ftright line (CD) makes the adjacent angles (ABD, ABC,) equal to one another, each of the angles is called a right angle ; and the rtraight line (AB) which ftands on the other (CD) is called я perpendicular. Fig. 7. XI. An Obtvfe... | |
 | Robert Simson - Trigonometry - 1775 - 534 pages
...placed at that point; « as the angle at li.' X. When a ftraight line flanding on another ftraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the ftraight line which flands on the other is called a perpendicular to it. — XI. An obtufe angle is... | |
 | Euclid - 1781 - 552 pages
...'letter placed at that point; as the Angle at E.' .X. When a ftraight line flanding on another ftraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the ftraight line which ftands on the other is called a perpendicular to it. XI. An obtufe angle is that... | |
 | Thomas Beddoes - Geometry - 1793 - 196 pages
...whether they are plane or otherwife. DEFINITION X, When a Jlfaight line ftanding on another Jiraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle, and the line which Jlands on the other is called a perpendicular to it. Here we have an appeal made to the... | |
 | Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...at that point ; as the angle at E.' VII. •/ f * When a ftraight line ftanding on another ftraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the ftraight line which ftands on the other is called a per- , pendicular to it. VJII vra. Ao obtufe angle... | |
 | Alexander Ingram - Trigonometry - 1799 - 374 pages
...letter placed at that point ; ' as the angle at E.X. When a ftraight line ftanding on another ftraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the ftraight line which ftands on the other is called a perpendicular to it. XI. An oUufe angle is that... | |
 | Robert Simson - Trigonometry - 1804 - 530 pages
...letter placed at that point ; as the angle at E.' X. When a ftraight line flanding on another ftraight line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the ftraight line which ftands on the other is called a .perpendicular to it. / XI. An obtufe angle js... | |
 | John Playfair - Mathematics - 1806 - 320 pages
...angle at a point, it may be expressed ' by a letter placed at that point ; as the angle at E.' VII. When a straight line standing on another straight...stands on the other is called a perpendicular to it. _____ VIII, Book I. An obtuse angle is that which is greater than a right angle. IX. An acute angle... | |
 | Robert Simson - Trigonometry - 1806 - 546 pages
...placed at that point; as < the angle at E.' X. When a straight line standing on another straight lii>e makes the adjacent angles equal to one another, each...stands on the other is 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... | |
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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. 
