| James Williamson - 1781
...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... | |
| Proclus (Diadochus.), Marinus (of Naples.) - 1789
...equal to two right. And thus much may fuflice concerning converfe theorems. But as we have difcovered **that the three angles of every triangle are equal to two right,** we ought to determine « certain method, by which we may find how many angles, of all other multangles,... | |
| Colin Macfarquhar, George Gleig - 1797
...that 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 - 351 páginas
...; 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... | |
| Sydney Smith, Lord Francis Jeffrey Jeffrey, Macvey Napier, William Empson, Sir George Cornewall Lewis, Henry Reeve, Arthur Ralph Douglas Elliot (Hon.), Harold Cox - 1818
...comparisons are 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
...; 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.... | |
| William Hazlitt - 1810
...Aristotelian 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... | |
| 1813
...while 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... | |
| John Playfair - 1819 - 333 páginas
...triangles, the four oblique angles of whJrh are equal to the three angles of the triangle, therefore **the three angles of every triangle are equal to two right angles.** Q, ED Though this method of treating the subject is strictly demonstrative, ;yet, as the reasoning... | |
| Bewick Bridge - 1821 - 227 páginas
...180°. Thus, if the angle ACF is 40° 25' 35", its supplement FCB will be 139° 34' 25".* 6. The * Since **the three angles of every triangle are equal to two right angles, or** to 180°, it is evident that in a right-angled triangle the two acute angles must be together equal... | |
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