| John Potter - Mathematics - 1753 - 568 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 - 488 pages
...oppofite angles of any quadrilateral figure defcribed in a circle, are together equal to two right T **angles. Let ABCD be a quadrilateral figure in the circle ABCD ; any two of its** oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles... | |
| Euclid - Geometry - 1765 - 492 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.] the angle c AB... | |
| Thomas Malton - 1774 - 482 pages
...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,... | |
| Robert Simson - Trigonometry - 1775 - 534 pages
...PROP. XXII. THEO R. THE oppofite angles of any quadrilateral figure deleribed in a circle, are together **equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD ; any two of its** oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles... | |
| 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 - 1781 - 550 pages
...PROP. XXII. THEO R. THE oppofite angles of any quadrilateral figure defcribed in a circle, are together **equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD ; any two of its** oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles... | |
| Robert Simson - Trigonometry - 1781 - 534 pages
...XXTI. THEO R- . THE oppofite angles of any quadrilateral figure deferibed in a circle, are together **equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD** i arry two of its oppofite angle* are together equal to two right angles. Join AC, BD ; and becaufe... | |
| 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... | |
| Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...-T.HJE O R. 'T'HE oppofite angles of any quadrilateral figure defcribed in Q circle, are togethuer eq^al **to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD ; any two of its** oppofite angles are together equal to two right angles. Join AC, BD ; and becaufe the three angles... | |
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