| John Potter - Mathematics - 1753 - 395 pages
...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 - Trigonometry - 1762 - 466 pages
...; 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... | |
| Euclid - Geometry - 1765 - 464 pages
...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. 3.]... | |
| Euclid - Geometry - 1776 - 318 pages
...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 - Euclid's Elements - 1781 - 324 pages
...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 - Encyclopedias and dictionaries - 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... | |
| Alexander Ingram - Trigonometry - 1799 - 351 pages
...; 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... | |
| 1818 - 638 pages
...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 - Trigonometry - 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... | |
| William Hazlitt - Orators - 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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