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A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
A Treatise on Surveying, Containing the Theory and Practice: To which is ... - 25 ページ
John Gummere 著 - 1814 - 346 ページ

## Pure Mathematics, 第 1 巻

Edward Atkins - 1874
...of two lines to one another in a plane, which meet together, but are not in the same direction. 9. A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. Thus, the angle contained by the straight lines AB and EC is expressed either by ABC or CBA, and the...

## The Shrewsbury Trigonometry: A Step to the Study of a More Complete Treatise ...

John Clement Primrose Aldous - 1874 - 71 ページ
...74—79. Logarithme 63 Miscellaneous Examples C7 CHAPTER L ANGLES AND THE MEASUREMENT OF ANGLES. 1 A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. This is one of Euclid's Definitions, which describes the nature of the angles treated of in Plane Trigonometry....

## The Elements of Euclid, containing the first six books, with a selection of ...

Euclides - 1874
...two lines to each other in a plane, which meet together, but are not in the same straight line. A 9. A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. NB When several angles are at one point B, either of them is expressed by three letters, of which the...

## A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C ...

Euclides - 1874
...of two lines to one another in a plane, which meet together, but are not in the same direction. 9. A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. 10. When a straight line standing on another straight line, makes the adjacent angles equal to one...

## Pure mathematics, 第 1 巻

Edward Atkins - 1874
...of two lines to one another in a plane, which meet together, but are not in the same direction. 9. A plane rectilineal angle is the inclination of two straight lines to one another, which meety together, but are not in the same straight line. GEOMETRY. Thus, the angle contained by the straight...

## THE QUADRATURE OF THE CIRCLE, THE SQUARE ROOT OF TWO, AND THE RIGHT-ANGLED ...

WILLIAM ALEXANDER MYERS - 1874
...not in the same direction. 22. A plane rectilineal angle is the inclination of two straight linesto one another which meet together, but are not in the same straight line. 23. A THEOREM is a truth requiring demonstration. 24. An AXIOM is a self-evident truth. 25. A PROBLEM...

## Elements of geometry, based on Euclid, books i-iii

Edward Atkins - 1876 - 119 ページ
...of two lines to one another in a plane, which meet together, but are not in the same direction. 9. A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. NOTE. — When several angles are at one point B, any one of them 13 expressed by three letters, of...

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

Robert Potts - 1876 - 403 ページ
...of two lines to each other in a plane, which meet together, but are not in the same direction. IX, A plane rectilineal angle is the inclination of two...another, which meet together, but are not in the same btraight line. D NB If there be only one angle at a point, it may be expressed by a letter placed at...

## Elements of geometry, based on Euclid, book i

Edward Atkins - 1877
...of two lines to one another in a plane, which meet together, but are not in the same direction. 9. A plane rectilineal angle is the inclination of two...meet together, but are not in the same straight line. NOTE. — When several angles are at one point B, any one of them ia expressed by three letters, of...

## Euclid, book i., propositions i. to xxvi., with exercises and alternative ...

Euclides - 1877
...which, any two points being taken, the straight line between them lies wholly in that superficies. 8. A plane rectilineal angle is the inclination of two...meet together but are not in the same straight line. An angle is generally expressed by three letters, the middle one of which must be the letter at the...