 | Royal Society (Great Britain) - 1722 - 722 σελίδες
...which were before prov'd to be equal to А В С, ВАС. QED Hence may be inferr'd as a Corollary, That the three Angles of every Triangle are equal to two Right ones ; for the Angks А С В -V- В С E, are meafur'd by a Semicircle, and therefore equal to two... | |
 | Royal Society (Great Britain) - 1749 - 674 σελίδες
...BCD-fJ)CE, which was before prov'd to be equal to ABC, ВАС. Q ED Hence may be inferr'd as a Corollary, That the three Angles of every Triangle are equal to two Right ones ; for the Angles А С В -|- В С Е, are meafur'd by a Semicircle, and therefore equal to two... | |
 | John Potter - 1753 - 568 σελίδες
...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... | |
 | Richard Griffith - 1757 - 360 σελίδες
...as well quote ddam for breathing, becaufe he was the firft Creature who did fo, as Euclid for faying that the three Angles of every Triangle are equal to two right ones, becaufe he was the firft Perfon who demonftrated that Propofition. A quoting Author is juft as... | |
 | Robert Simson - 1762 - 488 σελίδες
...; 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,... | |
 | Euclid - 1765 - 492 σελίδες
...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.... | |
 | Richard Griffith - 1767 - 314 σελίδες
...as well quote Adam for breathing, becaufe he was the firft creature who did fo, as Euclid for faying that the three angles of every triangle are equal to two right ones, becaufe he was the firft perfon who demonftrated that propofition *. A quoting author is juft... | |
 | Richard Shepherd - 1768 - 250 σελίδες
...that Julius Casfar was ftabbed in the Senate-houfe, or Richard the lild. flain in Bofworth field, as that the three angles of every triangle are equal to two right ones : yet I .believe the afcertainment of thofe fadts, as firmly as I do the demonftration <;f this.... | |
 | Richard Shepherd - 1768 - 242 σελίδες
...that Julius Casfar was ftabbed in the Senate-hbufe, or Richard the Hid. flain in Bofworth field, as that the three angles of every triangle are equal to two right Ones : yet I believe the afcertainment of thofe facts, as firmly as I do the demonftration of this.... | |
 | Thomas Malton - 1774 - 484 σελίδες
...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,... | |
| |
When you have proved that the three angles of every triangle are equal to two right angles... 
