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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. "
Euclid, books i. & ii., with notes, examples, and explanations, by a late ... - Σελίδα 1
των Euclides - 1879
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The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855
...is put in inverted commas, as being Dr. Simson's addition ; it is very necessary to be remembered. X When a straight line standing on another straight...stands on the other is called a perpendicular to it. By borrowing the terms vertical and horizontal from the language of Physics, we may define a right...

Mensuration of lines, areas, surfaces, and volumes

Robert Rawson - 1856
...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...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. xn. An acute angle is that which is...

The geometry of the three first books of Euclid, by direct proof from ...

Euclides - 1856
...straight line standing on another straight line makes the adjacent angles equal to each other, each of the angles is called a right angle, and the straight line which stands on the other is called perpendicular. PROPOSITIONS, i. Straight lines from the same point and in the same direction coincide....

Gradations in Euclid : books i. and ii., with an explanatory preface [&c ...

Euclides - 1858
...When a straight line standing on another straight lino makes the adjacent angles equal to each other, each of these angles is called a right angle; and...stands on the other is called a perpendicular to it. The angle CD A being equal to angle CDB, each of them is a right angle, and CD is a perpendicular to...

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

Robert Potts - 1860 - 361 σελίδες
...the angle ABD, or DBA ; and that which is contained by DB, CB, is called the angle DBC, or CBD. X. When a straight line standing on another straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XIL An acute angle is that which is...

Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ...

Euclides - 1860
...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...stands on the other is called a perpendicular to it. 12. The two adjacent angles which one straight line makes with another on the same side of it are called...

A course of geometrical drawing

William Schofield Binns - 1861
...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...stands on the other is called a perpendicular to it." The angles AB c, ABD, are right angles. Obs. 1. Because DB is in the same straight line with B c, the...

Euclid's plane geometry, books iii.-vi., practically applied; or, Gradations ...

Euclides - 1861
...st. line makes the adj. ¿_s equal to each other, each of these /.s is called a rt. ¿_ ; and the st. line which stands on the other is called a perpendicular to it. Ax. 1. Things which are equal to the same thing are equal to one another. EI 2 CI 2 Dat. Quass. Pst....

Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862
...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...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is that which is greater than a right angle. 13. A term or boundary is the extremity...

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

Euclides - 1863
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E. X. When a straight line standing on another straight...right angle ; and the straight line which stands on tbo other is called a perpendicular to it —!— XI. An obtuse angle is that which is greater than...




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