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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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## Euclid's plane geometry, practically applied; book i, with explanatory notes ...

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...line makes the adjacent angles equal to each other, each of these angles is called a right angle; D and the straight line which stands on the other is called a perpendicular to it. , The Anglo CDA being equal to angle CDB, each of them is a right angle, and CD is perpendicular toAB....

## The school edition. Euclid's Elements of geometry, the first six books, by R ...

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...the angle AB D, or DBA ; and that which is contained by lOB, CB, is called the angle DBC, or CBD. X. When a straight line standing on another straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which is...

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...the angle ABI), or DBA ; and that which is contained by DB, CB, is called the angle DEC, or CBD. X. When a straight line standing on another straight...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. xn. An acute angle is that which is...

## The College Euclid: Comprising the First Six and the Parts of the Eleventh ...

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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. An obtuse angle is that which is greater than a right angle. XVIII. A semicircle is the figure contained...

## An English primer; compiled under the superintendence of E.C. Lowe

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...inclination of two straight lines to one another, which meet together, but are not in the same straight line. 10. When a straight line standing on another straight...and the straight line which stands on the other is & perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute...

## Outlines of geometry; or, The motion of a point

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...one straight line standing upon another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle, and the straight lines are said to be perpendicular to each other." And as the angle in a straight line was shown to...

## The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1867 - 400 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...angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity...

## The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1867 - 400 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...angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity...

## Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

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...the angle AB D, or DBA ; and that which is contained by DB, CB, is called the angle DBG, or CBD. I When a straight line standing on another straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which is...

## Modern Methods in Elementary Geometry

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...placed between the other two. When an angle stands alone one letter only is often used, as A. 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. We acquire a clear idea of'the magnitude of an angle by supposing it...