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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.
The Carpet-dealer's Guide: A Manual of Practical Information on the Art of ... - Página 13
por John H. Macke - 1891 - 228 páginas
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The shipwright's vade-mecum [by D. Steel].

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...
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Geometrical and Graphical Essays: Containing a General Description of the ...

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,...
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The First Six Books with Notes

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...
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The Geometrical Companion, in which the Elements of Abstract Geometry are ...

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...
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The first six books of the Elements of Euclid: with notes

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...
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A System of Popular Geometry: Containing in a Few Lessons So Much of 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....
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The Elements of Euclid, the parts read in the University of Cambridge [book ...

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...
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Elements of Surveying and Navigation: With Descriptions of the Instruments ...

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...
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ELEMENTS OF GEOMETRY AND TRIGONOMETRY

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...
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Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

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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