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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 Elements of geometry; or, The first six books, with the eleventh and ... - Page 2
by Euclides - 1855

## A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Ralph Smyth, Sir Henry Edward Landor Thuillier - Surveying - 1851 - 828 pages
...another, which meet together, but are not in the same straight line.* When a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which stands upon the other is called a perpendicular...

## The First Two Books of the Elements of Euclid ... with Additional Figures ...

Euclides - 1852
...contained by BD, CB, is called the angle DBC, or CBD; but if there be only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E." [Observe that BAC is a greater angle than DEF, because the inclination of BA to AC is greater than...

## The first six books of the Elements of Euclid, with numerous exercises

Euclides - Geometry - 1853 - 176 pages
...С b, is called the angle db С, ог С bd ; but if there be only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at e. X. When a straight line standing on another straight line makes the adjacent angles equal to one another,...

## The synoptical Euclid; being the first four books of Euclid's Elements of ...

Euclides - 1853 - 146 pages
...contained by SB, CB, is called the angle DBC, or CBD; but, if there be only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E." x. When a straight line standing on another straight line makes the adjacent angles equal to one another,...

## The geometry, by T. S. Davies. Conic sections, by Stephen Fenwick

...by DB, CB, is called the angle DBC, or CBD ; but, if there be only one angle at a point, it may be expressed by a letter placed at that point : as the angle at E. 10. When a straight line standing on another straight line makes the adjacent angles equal to one another,...

## Elements of Geometry: Containing the First Six Books of Euclid with a ...

John Playfair - Geometry - 1855 - 336 pages
...' BD, CB, is called the angle DBC, or CBD ; but, if there be only one an' gle at a point, it may be expressed by a letter placed at that point; as the ' angle at £.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one...

## The geometry of the three first books of Euclid, by direct proof from ...

Euclides - 1856
...on the point of intersection between the straight lines or arms of the angle. XV. — RIGHT ANGLE. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of the angles is called a right angle, and the straight line which stands on the other...

## Mensuration of lines, areas, surfaces, and volumes

Robert Rawson - 1856
...by DB, CB, is called the angle DBC, or CBD ; but, if there be only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E." When a straight line standing on another straight line makes the adjacent angles equal to one another,...