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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. "
Outlines of Geometry ... - Σελίδα 29
των Walter Marsham Adams - 1866
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Treatise on Arithmetic, in Theory and Practice: With an Appendix, Containing ...

James Thomson (LL.D.) - 1837 - 296 σελίδες
...divergence. II. When one straight line standing on another, makes with it two angles which are equal, each of these angles is called a RIGHT ANGLE ; and the straight line which stands on the other is said to be PERPENDICULAR, Or AT RIGHT ANGLES, tO it, or tO be a PERPENDICULAR...

Euclid's Elements [book 1-6] with corrections, by J.R. Young

Euclides - 1838 - 264 σελίδες
...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 lines are said to be perpendicular to each other. IX. An obtuse angle is that which is greater than a right angle. An acute angle is that which is less...

The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846 - 292 σελίδες
...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 (Def. 10) ; therefore CH is perpendicular...

Orr's Circle of the Sciences: Organic nature, vols. 1-3 (1854-1856)

William Somerville Orr - 1854 - 534 σελίδες
...straight line (CD) makes the adjacent angles (А В С, А В D) equal to one another, each of the angles is called a right angle ; and the straight lines are said to be perpendicular to each other. Thus the two lines, AB, CD, are perpendicular to each other. An obtuse angle is ¿hat which is greater...

The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855 - 270 σελίδες
...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. By borrowing the terms vertical and...

Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 650 σελίδες
...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 lines are said to be perpendicular to each other (fig. 3). An obtuse angle is that which is greater than a right angle (fig. 4). Fig. 8. Fig. 4. Fig....

APPLETONS' CYCLOPAEDIA OF DRAWING

W.E. WORTHEN - 1857 - 600 σελίδες
...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 lines are said to be perpendicular to each other (fig. 3). An obtuse <mgle is that which is greater than a right angle (fig. 4). Fig. 8. Fig. 4, Fig....

Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 632 σελίδες
...straight line makes the adjacent angles equal to one another, each of the angles is called a rig fit angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse angle is that which is greater than a right angle (fig. 4). Fig. S. Fig. 4. Fig....

Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - 1860 - 380 σελίδες
...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. XL An obtuse angle is that which is...

The elements of plane geometry; or, The first six books of Euclid, ed. by W ...

Euclides - 1863 - 122 σελίδες
...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 tbo other is called a perpendicular to it —!— XI. An obtuse angle is that...




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