 | 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... | |
| |
The opposite angles of any quadrilateral figure described in a circle, are toe/ether equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD : any two of its opposite angles are together equal to two right angles. 
