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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.
Stories about Mathematics-land - Page 72
by D. Ponton - 1927

## The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ...

Robert Simson - Trigonometry - 1775 - 534 pages
...are not in the fame " direction." IX. A plane rectilineal angle is the inclination of two ftraight lines to one another, which meet together, but are not in the fame ftraight line. « NB Book I. B CE ' NB When feveral angles are at one point B, any one ' of them...

## The First Six Books: Together with the Eleventh and Twelfth

Euclid - 1781 - 552 pages
...are not in the fame " direction." IX. A plane rectilineal angle is- the inclination of two ftraight lines to one another, which meet together, but are not in the fame ftraight line. NB Book I. A! D CE * NB When fevcral angles are at one point B, any one of them...

## Elements of Geometry: Containing the Principal Propositions in the First Six ...

Euclid - Euclid's Elements - 1789 - 296 pages
...ftill a fuperfluous condition. He defines a rectilineal angle, to be " the inclination of two ftraight lines to one another, which meet together, but are not in the fame ftraight line ." Now their not being in the fame ftraight line, is a neceflfary confequence, obvioufly...

## Elements of Geometry;: Containing the First Six Books of Euclid, with Two ...

Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...which are formed by the meeting of other lines than ftraight lines. A pl»ne angle is faid to be ' the inclination of two lines to one another which meet together, but are not in the feme direftion.' This definition is omitted here, becaufe that the angles formed by the meeting of...

## The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - Trigonometry - 1799 - 374 pages
...in that fupeificies. VIII. Omitted. IX. A plane reftilineal angle is the inclination of two ftraight lines to one another, which meet together, but are not in the fame ftraight line. B NB BooK T. ' NB When feveral angles are at one point B, any one * of them is...

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

John Playfair, Euclid - Circle-squaring - 1804 - 468 pages
...by the meeting of other lines than flraight lines. A plane angle is faid to be " the inclina" tion of two lines to one another which meet together, but are " not in the fame direftion." This definition is omitted here, becaufe that the angles formed by the meeting of...

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

John Playfair - Euclid's Elements - 1806 - 320 pages
...them lies wholly in that superficies. VI. 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 NB ' When several angles are at one point B, any one ' of them is expressed by three letters, of...

## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 546 pages
...are not in the same " direction." IX. 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. B B C NB c When several angles are at one point B, any one of < them is expressed by three letters,...