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When you have proved that the three angles of every triangle are equal to two right angles...
The Elements of Euclid: With Dissertations Intended to Assist and Encourage ... - Seite 86
von Euclid, James Williamson - 1781 - 309 Seiten
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## A System of Practical Mathematics: ... With a Plain Account of the Gregorian ...

John Potter - 1753 - 568 Seiten
...of the Sides is oppofite the given Angle ; but mud be folved by the fecond Rule, Page 224. Now, as the three Angles of every Triangle are equal to two right Angles, or 180°, the Angle at A 36° . 40', being fubtrafted from 180°, leaves 143° . 20', the Sum of the...
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## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - 1762 - 488 Seiten
...; any two of its oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles of every triangle are equal • to two right angles, the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA are equal to two right angles,...
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## Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books

Euclid - 1765 - 492 Seiten
...D be defcribed in it : I fay, its oppofite angles are equal to two right angles. Join Ac, BD. Then becaufe [by 32. i.] the three angles of every triangle are equal to two right angles, the three angles CAB, ABc, BC A of the triangle ABC will be equal to two right angles. But [by 2I....
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## A Royal Road to Geometry: Or, an Easy and Familiar Introduction to the ...

Thomas Malton - 1774 - 484 Seiten
...wanting four ; and by the 2nd, all the external Angles are equal to four Right Angles. Alfo, by the loth, the three Angles of every Triangle are equal to two Right Angles; and all the Angles, about a Point, are equal to four; (2.i.) confequently, fince the three Angles DEF,...
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## The Elements of Euclid,: In which the Propositions are Demonstrated in a New ...

Euclid - 1776 - 318 Seiten
...angles0;, therefore the fix angles ABD, ABC, ACB, v ACD, ADC, ADB, are greater than two right angles: But c the three angles of every triangle are equal to two right angles • therefore the nine angles CBA, BCA, BAC, ACD, CAD, ADC, ADB, ABD, DAB, ate equal to fix right angles...
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## Encyclopædia Britannica: Or, A Dictionary of Arts, Sciences ..., Band 8,Teil 1

Colin Macfarquhar, George Gleig - 1797 - 414 Seiten
...converfation relate to thefpeaier, the party addrejjed, or a Greet book. In this fentence, " ifay that the three angles of every triangle are equal to two right angles," thejfrcahr is furely not theyú¿№ 142. in converfation, or when a man, in the character of a public...
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## The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - 1799 - 374 Seiten
...; any two of its oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles of every triangle are equal * to two right angles, the three angles of the a 3». i. triangle CAB, viz. the angles CAB, ABC, BCA are equal to two right...
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## The Edinburgh Review: Or Critical Journal, Band 30

1818 - 638 Seiten
...invidious, unless when they are invidiously pursued, would be puerile. No man, when he learns that the three angles of e•very triangle are equal to two right angles, ever thought of saying, that the series of comparisons by which that truth is demonstrated was invidious...
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## The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - 1804 - 530 Seiten
...; any two of its oppofite angles are together equal to. two right angles. Join AC, BD ; and becaufe the three angles of every triangle are equal » to two right angles, the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA are equal to two right angles....
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## The Eloquence of the British Senate: Being a Selection of the Best ..., Band 1

William Hazlitt - 1810 - 544 Seiten
...or the Cartesian system : nay, if any such law were made against all those who did not believe that the three angles of every triangle are equal to two right angles, I make no doubt but that this plain demonstration would be most violently opposed by great numbers...
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