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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.
The first book of Euclid's Elements, simplified, explained and illustrated ... - Σελίδα 6
των Euclides - 1847
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## Euclid's plane geometry, practically applied; book i, with explanatory notes ...

Euclides - 1863
...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 elements of plane geometry; or, The first six books of Euclid, ed. by W ...

Euclides - 1863
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight line which stands on tbo other is called a perpendicular to it —!— XI. An obtuse angle is that which is greater than...

## A practical treatise on ... land and engineering surveying, Τόμος 34

Henry S. Merrett - 1863
...circle, as ABC, Fig. 12, Plate 1. An acute angle is that which is less than a right angle, as ABD. An obtuse angle is that which is greater than a right angle, or more than 90 degrees, as DB E. Problem 12. To draw an angle equal to another, Fig. 13. With any...

## A Practical Treatise on the Science of Land and Engineering Surveying ...

Henry S. Merrett - 1863 - 317 σελίδες
...circle, as A В С, Fig. 12, Plate 1. An acute angle is that which is less than a right angle, as A В D. An obtuse angle is that which is greater than a right angle, or more than 90 degrees, as D В E. Problem 12. To draw an angle equal to another, Fig. 13. With any...

## Euclid's Elements of geometry, the first four books, by R. Potts. Corrected ...

Euclides - 1864
...line standing on another straight line, makes the adjacent angles equal to one another, each of these 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. xn. An acute angle is that which is...

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

Euclides - 1864
...line standing on another straight line, makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the 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...

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

Euclides - 1865
...adjacent angles. But, ' 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 ;' (def. 10) therefore each of the angles DCF, ECF, is a right angle. Wherefore, from the point C,...

## Elements of plane geometry, book i, containing nearly the same propositions ...

Euclides - 1865
...RIGHT ANGLE; and the straight line which stands upon the other is called a PERPENDICULAR to it. 10. An OBTUSE ANGLE is that which is greater than a right angle. 11. An ACUTE ANGLE is that which is less than a right angle. 12. PARALLEL LINES, or those straight...

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

Edward Clarke Lowe - 1866
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle; 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...

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

Euclid, Isaac Todhunter - 1867 - 400 σελίδες
...BFE. [I. 8. But 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 ; [I. Definition 10. therefore each of the angles AFE, BFE is a right angle. Therefore the straight...