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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.
Instructions Given in the Drawing School Established by the Dublin Society ... - Side 29
av Joseph Fenn - 1769
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## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - 1762 - 466 sider
...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...lines meeting in one point, are together equal to four ri^ht angles. PROP. B Book I. PROP. XVI. THEOR, \-or>^ TF one fide of a triangle be produced, the exterior...
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## The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ...

Robert Simson - 1775 - 520 sider
...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 to four right angles. PROP. Book I. B 10. i. e 4- 1• I3. i. PROP. XVI. THEO...
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## The First Six Books: Together with the Eleventh and Twelfth

Euclid - 1781 - 520 sider
...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...lines meeting in one point, are together equal to four rich: angles. PR on. Book I. a. i0. i. S. I{. i. c-4 I. 4. t5. i. a. i6. t. PROP. XVI. THEO R. IF one...
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## The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - 1799 - 351 sider
...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 to four right angle?. CoR. 3. Likewife, if two ftrnight lines CE, ED, on oppofite fides of a ftraight line AB, meet...
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## The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - 1804
...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 oqual to four right angles. _ Book I. b. 15. i. c. 4. i. d. 15. i. a. in, i. , PROP. XVI. THEOR. IF...
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## Elements of Geometry;: Containing the First Six Books of Euclid, with a ...

Euclid, John Playfair - 1804 - 440 sider
...together equal to four right angles. CoR. 2: And hence, all the angles made by .<.ny number of ftraight lines meeting in one point, are together equal to four * right angles. C a PROP. Book I. . PROP. XVI. THEO R. IF one fide of a triangle be produced, the exterior angle is...
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## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - 1806 - 518 sider
...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...one point, are together equal to four right angles. Book I. PROP. XVI. THEOR. a 10. 1. b IS. 1. the angle the angle are oppotherefore B IF one side of...
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## The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814
...make at the point where they cut, are together equal to four right angles. C0R. 2. And consequently that all the angles made by any number of lines meeting in one point, are together •qua! to four right angles. C PROP. XVI. THEOR. IF one side of a triangle be produced, the exterior...
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## The Monthly Review

...restored the text of his author. In proposition 15. the editor has left out the second corollary, viz. " that all the angles made by any number of lines meeting...one point are together equal to four right angles." This, it seems, has not a place in most of the MSS. of the Imperial Library, but is found in some of...
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## Elements of Geometry: Containing the First Six Books of Euclid: With a ...

John Playfair - 1819 - 317 sider
...together equal to four right angles. COR. 2. And hence, all the angles made by any number of straight lines meeting in one point, are together equal to four right angles-. r PROP. XVI. THEOR. If one side of a triangle be produced, the exterior angle is greater than cither...
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