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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. "
The First Six Books: Together with the Eleventh and Twelfth - Pagina 10
door Euclid - 1781 - 520 pagina’s
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Imperial Reference Library: Comprising a General Encylopædia ...

1898 - 610 pagina’s
...6m, is named the angle с m Ъ. — When a straight line, cm, standing on another straight line, a b. makes the adjacent angles equal to one another, each of the angles erne, cmb, is culled a right anglr; and the straight lines are said to be perpendicular to each other....
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A Text-book of Euclid's Elements for the Use of Schools. Books I.-VI ..., Boek 1

Euclid, Henry Sinclair Hall, Frederick Haller Stevens - 1900 - 330 pagina’s
...are also vertically opposite to one another. 10. 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. 1 1 . An obtuse angle is an...
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A Text-book of Euclid's Elements for the Use of Schools, Boek 1

Euclid - 1904 - 488 pagina’s
...are also vertically opposite to one another. 10. 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. 1 1 . An obtuse angle is an...
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Encyclopedia of Engineering: A Treatise on Boilers, Steam Engines ..., Volume 7

Calvin Franklin Swingle - 1906 - 490 pagina’s
...same straight line as in Fig. 34. Fi(. 34. Fig 35. 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 as in Fig 35. Fig. 38. An obtuse...
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Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - 1906 - 168 pagina’s
...are not in the same straight line as in Fig. 34. 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 as in Fig. 35. An obtuse angle...
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Modern Sheet-metal Workers' Instructor: Practical Geometry, Mensuration ...

Joseph H. Rose - 1906 - 340 pagina’s
...same straight line as in Fig. 1. Fig. 1. Fig. 2. 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 as in Fig. 2. GEOMETEIIAI A...
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A School Geometry, Delen 1-4

Henry Sinclair Hall - 1908 - 286 pagina’s
...also vertically opposite to one another. 7, When one straight line stands on another so as to make the adjacent angles equal to one another, each of the angles is called a right angle • and each line is said to be perpendicular to the other. AXIOMS, (i) If O is a point in a straight line...
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Introduction and books 1,2

Euclid - 1908 - 550 pagina’s
...the angle ECF; [i. 8] and they are adjacent angles. But, when a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal ingles is right ; [Def. 10] therefore each of the angles DCF> FCE is right. Therefore the straight...
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The Teaching of Geometry

David Eugene Smith - 1911 - 360 pagina’s
...confine our attention to having the concept understood. 10. 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...
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Standard American Cyclopedia of Steam Engineering: A Treatise on the Care ...

Calvin Franklin Swingle - 1913 - 1270 pagina’s
...same straight line as in Fig. 34. Fig. 34. Fig. 35. 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 as in Fig 35. Fig. 36. An obtuse...
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