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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 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...

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...line, standing on another straight line, makes the adjacent an. gles equal to one another, each of the angles is called a right angle; and the straight line...angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. Thus the angles ABC, ABD are each of them...

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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...

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

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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 line...stands on the other is called a perpendicular to it : thus the line AC is perpendicular to DB, and makes with it the two adjacent angles CAD, CAB, equal...

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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 line...stands on the other is called a perpendicular to it. [That there may be two such angles equal, may be exhibited by the following figures: DC meets the right...

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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...a perpendicular to it. 11. An obtuse angle is that \vhich is greater than a right angle. 12. An acute angle is that which is less than a right angle....

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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...

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...another straight line makes the adjacent angles equal to one another, each of the angles is called a rigM angle ; and the straight line which stands on the other is called a perpendicular toit. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that...




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