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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 book of Euclid's Elements, simplified, explained and illustrated ... - Σελίδα 6
των Euclides - 1847
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The First Six, and the Eleventh and Twelfth Books of Euclid's Elements: With ...

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...line standing on another makes the adjacent angles equal, each of the angles is called a right ample; and the straight line which stands on the other is called a perpendicular to it, and is said to be at right angles to it. 9. An obtuse angle is that which is greater than a right angle....

A system of practical mathematics; being no.xvi. of a new series of school-books

Scottish school-book assoc - 1845
...PLANE GEOMETRY. 9. 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 strnight line which stands on the other is called a perpendicular to it. 10. An obtuse angle is that...

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...' angle at £.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other, is called a perpendicular to it. 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is...

The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846
...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...stands on the other is called a perpendicular to •it (Def. 10) ; therefore CH is perpendicular to AB : Wherefore, from the given point C without it, CH...

The Elements of Geometry, Symbolically Arranged

Great Britain. Admiralty - 1846
...The extremities of a superficies are lines. VII. A plane superficies is that in which any two «r C angle; and the straight line which stands on the other, is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...

The Elements of Geometry, Symbolically Arranged

Great Britain. Admiralty - 1846
...only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E. X. angle; and the straight line which stands on the other, is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...

The definitions, postulates, axioms, and enunciations of the propositions of ...

Euclides - 1848
...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...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...

Lessons on the delineation of form

Charles Richson - 1848
...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 other is called & perpendicular to it." QUESTION upon these definitions, if given. 27 II. — To draw four right (...

An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1848 - 288 σελίδες
...are perpendicular to each other.* il. An acute angle is that which is lesi than a right angle. 12. An obtuse angle is that which is greater than a right angle. • Any angle differing from a right one, is, by some writers, called an oblique angle. 13 A circle...

The first three books of Euclid's Elements of geometry, with theorems and ...

Euclides, Thomas Tate - 1849 - 108 σελίδες
...;ingle at E." ' x. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...on the other is called a perpendicular — to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...




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