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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.' We find it convenient for the purposes of angular measurement to divide the right angle into smaller...

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...said to bisect the angle between the non-coincident sides BA and BE. Fig. 6 Fig. 7 0 Fig. 8 O Fig. 9 called a right angle; and the straight line which stands on the other is said to be perpendicular or at right angles to it. Thus, if the adjacent angles AOC and BOC are equal...

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...Def. 11. therefore the angle CHF is equal to the angle CHG ; I. 8. and these are adjacent angles. But when a straight line, standing on another straight...stands on the other is called a perpendicular to it. Therefore CH is a perpendicular drawn to the given straight line AB from the given point C without...

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...DEFINITION 11. If two adjacent angles made by two straight lines at the point where they meet be equal, each of these angles is called a right angle, and the straight lines are said to be at right angles to each other. Either of two straight lines which C are at right...

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...When a straight line standing on another makes the adjacent angles equal to each other, f each of the angles is called a Right Angle; and the straight line which stands ou the other side is said to be perpendicular or at right angles to it. A_ Thus, if the adjacent angles...

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...straight line standing on another straight line makes the adjacent angles equal to one another, I v/ \ GB each of these angles is called a right angle, and...stands on the other is called a perpendicular to it (Definitions). Therefore CH is a perpendicular drawn to the given straight line AB from the given point...

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...makes the adjaG. 9.— Pendulum swinging cent angles equal to one another, each through arc /«. r .1 and the straight line which stands on the other is called a perpendicular to it." Notice that " perpendicular " does not always mean upright, but making equal angles on both or all...

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...adjacent angles. But when one straight line, standing on another, makes the adjacent angles equal, each of these angles is called a right angle, and...stands on the other is called a perpendicular to it. Def. 10. Therefore CH is perpendicular to AB, and has been drawn from the point C without it. QEF NOTE....




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