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Cor. 2. And consequently that all the angles made by any number of lines meeting in one point, are together equal to four right angles.
Instructions Given in the Drawing School Established by the Dublin Society ... - Page 29
by Joseph Fenn - 1769

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

Robert Simson - Trigonometry - 1762 - 488 pages
...therefore if two ftraight lines, &c. Q^ED CoR. T. From this it is manifeft that if two ftraight lines cnt one another, the angles they make at the point where...they cut, are together equal to four right angles. CoR. 2. And confequently that all the angles made by any number of lines meeting in one point, are...

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

Euclid - 1781 - 552 pages
...Therefore, if two Itraight lines, &c. QED CoR. r. From this it is manifeft, that, if two ftraight lines cut one another, the angles they make at the point where they cut, arc together equal to four right angles. CoR. 2. And confequently that all the angles made by any number...

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

Alexander Ingram - Trigonometry - 1799 - 374 pages
...two ftraight lines, See. Q.. ED CoR. i. From this it is manifeft, that, if two- ftraight lines cut one another, the angles they make at the point where...they cut, are together equal to four right angles. CoR. 2. And confequrntly, that all the angles made by any number of lines meeting in one point, are...

## The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - Trigonometry - 1804 - 530 pages
...two ftraight lines, &c. Q^ ED CoR. i. From this it is manifeft that if two ftraight lines cut •ne another, the angles they make at the point where they cut, are together equal to four right angles. CoR. 2. Ağd confequentiy that all the angles made by any number of lines meeting in one point, are...

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

Euclides - 1816 - 588 pages
...Therefore} if two -straight lines, &c. QED COR. 1. From this it is manifest, that, if two straight lines cut one another, the angles they make at the point where...they cut, are together equal to four right angles. COR; 2. And consequently that all the angles made by any number of lines meeting m one point, are together...

## A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ...

Daniel Cresswell - Geometry - 1816 - 352 pages
...(44.) COR. 3. Hence, if two arches of circles cut one another, in a sphere's surface, the angles which they make, at the point where they cut, are, together, equal to four right angles (Art. 42.) PROP. I. (45.) Theorem. All the straight lines which touch any number of great circles,...

## A Popular Course of Pure and Mixed Mathematics ...: With Tables of ...

Peter Nicholson - Mathematics - 1825 - 1046 pages
...if two straight lines, &c. QED Сок. 1. From this it is manifest that, if two straight lines cut one another, the angles they make at the point where...they cut, are together equal to four right angles. Сок. 2. And consequently that all the angles made by any number of lines meeting in one point, are...

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

Robert Simson - Trigonometry - 1827 - 546 pages
...QED COB. 1. From this it is manifest, that, if two straight lines cut one another, the angles which they make at the point where they cut, are together equal to four right angles. COR. 2. And consequently that all the angles made by any number of lines meeting in one point, are...