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" When you have proved that the three angles of every triangle are equal to two right angles... "
Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books - Side 130
av Euclid - 1765 - 464 sider
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A System of Practical Mathematics: ... With a Plain Account of the Gregorian ...

John Potter - 1753 - 395 sider
...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 - 466 sider
...; 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, but the angle CAB...
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A Royal Road to Geometry: Or, an Easy and Familiar Introduction to the ...

Thomas Malton - 1774 - 440 sider
...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: With Dissertations Intended to Assist and Encourage ...

Euclid, James Williamson - 1781 - 309 sider
...it ; I fay that the oppofite angles of it are equal to two right angles. Let AC, BD be joined. And becaufe (by 32. i.) the three angles of every triangle are equal to two right angles; CAB, ABC, BCA the three angles of the triangle ABC are equal to two right angles : but CAB is equal...
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Encyclopædia Britannica: Or, A Dictionary of Arts, Sciences ..., Volum 8,Del 1

Colin Macfarquhar, George Gleig - 1797
...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 - 351 sider
...; 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 angles : But the...
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The Edinburgh Review: Or Critical Journal, Volum 30

1818
...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
...; 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. but the angle CAB...
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The Eloquence of the British Senate: Being a Selection of the Best ..., Volum 1

William Hazlitt - 1810
...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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The Freethinking Christians' Magazine: Intended for the Promotion ..., Volum 3

1813
...they concurred in the plain and pre-established propositions that " two and two are four, and that the three angles of every triangle are equal to two right angles," were perfectly correct, and found every thing as it should be; " but, when each left this guide, and...
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