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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. "
Geometry Without Axioms; Or the First Book of Euclid's Elements. With ... - Σελίδα 51
των Thomas Perronet Thompson - 1833 - 150 σελίδες
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Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - 1906 - 157 σελίδες
...to one another in a plane which meet together, but are not in the same straight line as in Fig. 34. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig. 35. An obtuse angle is that which is greater than a right angle as in Fig. 36. Fig. 36....

Encyclopedia of Engineering: A Treatise on Boilers, Steam Engines ..., Τόμος 7

Calvin Franklin Swingle - 1906
...a plane which meet together, bnt are not in the same straight line as in Fig. 34. Fi(. 34. Fig 35. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig 35. Fig. 38. An obtuse angle is that which is greater than a right angle as in Fig. 36. An...

Modern Sheet-metal Workers' Instructor: Practical Geometry, Mensuration ...

Joseph H. Rose - 1906 - 309 σελίδες
...in a plane which meet together, but are not in the same straight line as in Fig. 1. Fig. 1. Fig. 2. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig. 2. GEOMETEIIAI A tine s Ls-^ri "w^i Th? ai/K "..« if i : A straigfe: extreme p:ira». A...

A School Geometry, Μέρη 1-4

Henry Sinclair Hall - 1908 - 138 σελίδες
...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...

The advanced class-book of modern geography, by W. Hughes and J.F. Williams ...

William Hughes - 1908
...other in a plane which meet together, but are not in the same straight line. A Right Angle is formed when a straight line standing on another straight line makes the adjacent angles equal to each other. Each of these angles is called a right angle, and the straight line which stands on the...

Introduction and books 1,2

Euclid - 1908
...containing the angle are straight, the angle is called rectilineal. 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...

The Teaching of Geometry

David Eugene Smith - 1911 - 339 σελίδες
...therefore 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...

Standard American Cyclopedia of Steam Engineering: A Treatise on the Care ...

Calvin Franklin Swingle - 1913 - 1249 σελίδες
...a plane which meet together, but are not in the same straight line as in Fig. 34. Fig. 34. Fig. 35. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig 35. Fig. 36. An obtuse angle is that which is greater than a right angle- as in Fig. 36....

Yale Yesterdays

Clarence Deming - 1915 - 254 σελίδες
...Semper compescis hanc nostrum obsecrationem audi. and the text of a sermon of the Class of '52 reads: "When a straight line standing on another straight...makes the adjacent angles equal to one another each of these angles is called a three and a half and the line thus placed is called a rush." RHYMES OF THE...

Geometry, Relativity, and the Fourth Dimension

Rudy von Bitter Rucker - 1977 - 133 σελίδες
...of this postulate is not clear until we have defined right angles: "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." This postulate seems to be equivalent to the assumption that the things we...
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