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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
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο

The Elements of Plane and Solid Geometry ...

Edward Albert Bowser - 1890 - 393 σελίδες
...said to bisect the angle between the non-coincident sides BA and BE. Fig. 6 Fig. 7 0 Fig. 8 O Fig. 9 called a right angle; and the straight line which stands on the other is said to be perpendicular or at right angles to it. Thus, if the adjacent angles AOC and BOC are equal...

The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid, Robert Simson - 1892 - 518 σελίδες
...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...stands on the other is called a perpendicular to it. Therefore CH is a perpendicular drawn to the given straight line AB from the given point C without...

Plane and Solid Geometry

James Howard Gore - 1898 - 210 σελίδες
...other. 35. When a straight line standing on another makes the adjacent angles equal to each other, f each of the angles is called a Right Angle; and the straight line which stands ou the other side is said to be perpendicular or at right angles to it. A_ Thus, if the adjacent angles...

Elementary Physiography: An Introduction to the Study of Nature

John Thornton - 1899 - 427 σελίδες
...makes the adjaG. 9.— Pendulum swinging cent angles equal to one another, each through arc /«. r .1 and the straight line which stands on the other is called a perpendicular to it." Notice that " perpendicular " does not always mean upright, but making equal angles on both or all...

Mathematics: Mechanic's bids and estimates. Mensuration for beginners. Easy ...

Seymour Eaton - 1899 - 340 σελίδες
...lines to each other in a plane, which meet, but are not in the same straight line (A). MATHEMATTCS 8. When a straight line standing on another straight line makes the adjacent angles equal, each is called a right angle (B). The line which stands upon the other is called a perpendicular to...

Imperial Reference Library: Comprising a General Encylopædia ...

1898
...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....

A Text-book of Euclid's Elements for the Use of Schools, Books I.-IV.

Henry Sinclair Hall, Frederick Haller Stevens - 1900 - 304 σελίδες
...to be verticaIIy opposite. The two angles CEB, AED are also vertically opposite to one another. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is an angle which is greater than a right angle. 12. An acute angle is an angle...

Ellen: Or, Whisperings of an Old Pine, Τόμος 1

Joseph Battell - 1903
...would be reasonably correct ; but in most respects not as accurate as that of Euclid, which reads : 'When a straight line standing on another straight...line makes the adjacent angles equal to one another, the angle is called a right angle ; and the straight line which stands on the other is called a perpendicular...

First Stage Practical Plane and Solid Geometry

G. F. Burn - 1903 - 255 σελίδες
...angle, and obtuse when greater than a right angle. Angle CAB or angle A = 40°, is indicated thus : When a straight line standing on another straight line makes the adjacent angles equal ' pjg. 5. to one another, each of these angles is called a right angle; and the straight line which...

A Text-book of Euclid's Elements for the Use of Schools, Βιβλίο 1

Euclid - 1904 - 456 σελίδες
...to be vertically opposite. The two angles CEB, AED are also vertically opposite to one another. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is an angle which is greater than a right angle. 12. An acute angle is an angle...




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