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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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...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, in the figure, if the angle ABC is equal to the angle ABD each of them is a right angle, and...

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...line standing oil 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. XI. An obtuse angle is greater than a right angle. XII. An acute angle...

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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...angle is that which is greater than a right angle. / 18. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity...

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...angles are such as have a common vertex, and are on opposite sides of a common side. 1 8. When one straight line standing on another straight line makes...and the straight line which stands on the other is said to be perpendicular to it. 19. When one straight line meeting another straight line makes the...

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...line standing on another straight lino makes tho adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on tho other is called a perpendicular to it. 1 1 . An obtuse angle is that which is greater than a right...

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