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" When you have proved that the three angles of every triangle are equal to two right angles... "
Popular and Mathematical Astronomy, with the principal formulæ of Plane and ... - Page 54
by William Thomas READ - 1862
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Philosophical Transactions and Collections, to the End of the Year ..., Volume 1

Royal Society (Great Britain) - Science - 1722 - 722 pages
...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...
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The Philosophical Transactions and Collections to the End of the ..., Volume 1

Royal Society (Great Britain) - Science - 1749 - 674 pages
...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...
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A System of Practical Mathematics: ... With a Plain Account of the Gregorian ...

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...
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A Series of Genuine Letters Between Henry and Frances, Volume 2

Richard Griffith - 1757 - 360 pages
...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...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1762 - 488 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,...
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Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books

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....
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A series of genuine letters between Henry and Frances [by R. and E. Griffith].

Richard Griffith - 1767 - 314 pages
...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...
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Letters to the Author of A Free Enquiry Into the Nature and Origin of Evil ...

Richard Shepherd - Good and evil - 1768 - 250 pages
...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....
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Letters to Soame Jenyns, Esq., Occasioned by His Free Enquiry Into the ...

Richard Shepherd - Good and evil - 1768 - 242 pages
...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....
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A Royal Road to Geometry: Or, an Easy and Familiar Introduction to the ...

Thomas Malton - 1774 - 484 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,...
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