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" if two straight lines" &c. QED COR. 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. "
An introduction to geometry, consisting of Euclid's Elements, book i ... - Page 50
by Euclides - 1884
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1762 - 488 pages
...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 together equal...
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Instructions Given in the Drawing School Established by the Dublin Society ...

Joseph Fenn - Mathematics - 1769 - 536 pages
...II. COROLLARY I. f'R 0 M this it is manifeß, that if two ßraigbt linescut one another, the angles they make at the point where they cut, are together equal to four right angles. COROLLARY II. Д ND confequently, that all the angles made by any number of lines meeting in one point,...
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Instructions Given in the Drawing School Established by the Dublin Society ...

Joseph Fenn - Mathematics - 1769 - 524 pages
...COROLLARY I. FR OM this it is manifeß, that if two ßraigbt linescut one another, the anglet tbey make at the point -where they cut, are together equal to four right angles. COROLLARY II. ¿4 ND confequcntly , that all the angles made by any number of line t meeting in ene...
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The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ...

Robert Simson - Trigonometry - 1775 - 534 pages
...From this it is manifeft, that, if two ftraight lines cut one another, the angles they make at Hie 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 pohAare together equal...
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The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - Trigonometry - 1799 - 374 pages
...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 together equal...
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The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - Trigonometry - 1804 - 530 pages
...&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. A»d confequentiy that all the angles made by any number of lines meeting in one point, are together...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 546 pages
...&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...consequently, that all the angles made by any number of lines meeting in one point, are together equal to four right angles. Book I. PROP. XVI. THEOR. a 10....
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - Geometry - 1810 - 554 pages
...lines, &c. QED CoH. 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. CoH. 2. And consequently that all the angles made by any number of lines meeting in one point, are...
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclides - 1816 - 588 pages
...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...consequently that all the angles made by any number of lines meeting m one point, are together equal to four right angles. C D o« I. PROP. XVI. THEOR^. IF...
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A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ...

Daniel Cresswell - Geometry - 1816 - 352 pages
...and E. 15. 1.) (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,...
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