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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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## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

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...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 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is...

## Elements of geometry: consisting of the first four,and the sixth, books of ...

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...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. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...

## A course of practical geometry for mechanics

William Pease - 1843 - 68 σελίδες
...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. Beginners are apt to suppose that a perpendicular, must be a vertical, or plumb line, which it need...

## Lectures on the Principles of Demonstrative Mathematics

Philip Kelland - 1843 - 147 σελίδες
...When a straight line standing on another 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. By looking over the propositions of Euclid's first Book it will be seen that the only definitions which...

## Euclid's Elements of geometry [book 1-6, 11,12] with explanatory notes ...

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...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...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 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

...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 which is greater than a right angle. 1 1 . An acute angle is that which...

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

Euclides - 1846
...CG— therefore (I. 8) the angle CHF is equal to the angle CHG ; and they are adjacent angles : But, when a straight line standing on another 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...

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

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...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. 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is...