 | John Potter - 1753 - 568 pàgines
...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... | |
 | Robert Simson - 1762 - 488 pàgines
...; 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... | |
 | Thomas Malton - 1774 - 484 pàgines
...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,... | |
 | Euclid - 1776 - 318 pàgines
...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... | |
 | Euclid, James Williamson - 1781 - 324 pàgines
...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... | |
 | Colin Macfarquhar, George Gleig - 1797 - 414 pàgines
...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... | |
 | Alexander Ingram - 1799 - 374 pàgines
...; 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... | |
 | 1818 - 638 pàgines
...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... | |
 | Robert Simson - 1804 - 530 pàgines
...; 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... | |
 | William Hazlitt - 1810 - 544 pàgines
...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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When you have proved that the three angles of every triangle are equal to two right angles... 
