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" The sum of the three angles of any triangle is equal to two right angles, this is a Theorem, the truth of which is demonstrated by Geometry. "
A Course of Mathematics ...: Composed for the Use of the Royal Military ... - Page 2
by Charles Hutton - 1811
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Calendar

University of St. Andrews - 1904 - 790 pages
...The exterior angle of a triangle is equal to the sum of the two interior and opposite angles ; and the sum of the three angles of any triangle is equal to two right angles. The three larger angles of a quadrilateral are respectively twice, four times and five times the least....
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The North American Review, Volume 99

Jared Sparks, Edward Everett, James Russell Lowell, Henry Cabot Lodge - American fiction - 1864 - 658 pages
...offered solution. * Kritik dr Vern., p. 32. For an illustration, let the following theorem be taken : " The sum of the three angles of any triangle is equal to two right angles." We draw or conceive a particular triangle for the sake of the demonstration ; and, having gone through...
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