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" ... the three angles of a triangle are together equal to two right angles, although it is not known to all. "
The Works of John Playfair ...: With a Memoir of the Author ... - Page 335
by John Playfair - 1822
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Love and Penalty: Or, Eternal Punishment Consistent with the Fatherhood of God

Joseph Parrish Thompson - 1860 - 382 pages
...such a fact does not admit of absolute demonstration. A mathematical demonstration — such as that the three angles of a triangle are together equal to two right angles — does not admit the possibility of a doubt. But moral and metaphysical subjects do not admit of...
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The examination papers as set for the preliminary literary examination of ...

Royal college of surgeons of England - 1860 - 336 pages
...these shall be less than the other two sides of the triangle, but shall contain a greater angle. . 5. The three angles of a triangle are together equal to two right angles ; and all the angles of any rectilineal figure, together with four right angles, are equal to twice...
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The Advantages of Association of Ideas in Teaching: Addressed to the ...

Andrew Jackson Moulder - 1862 - 32 pages
...amount of reasoning could convince us of these facts. But none of our senses could satisfy us that the three angles of a triangle are together equal to two right angles. There are two modes of reasoning, so called, the distinction between which is clearly marked, and should...
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Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862 - 140 pages
...equilateral; 4. Therefore the three angles, EGD, GDE, DEG, are equal to one another. (I. 5 cor.) 5. But the three angles of a triangle are together equal to two right angles; (I. 32.) 6. Therefore the angle EGD is the third part of two right angles. 7. In the same manner it...
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A Second Book in Geometry

Thomas Hill - 1863 - 136 pages
...right angles. CHAPTER III. REASONING. 21. SUPPOSE that we wished to make another person believe that the three angles of a triangle are, together, equal to two right angles. One way of convincing him would be to take a triangular piece of card, or of paper, cut off the corners...
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Guide to the Civil service

Henry White - 1864 - 156 pages
...meant by a corollary? State and prove the corollaries to the proposition in which it is proved that the three angles of a triangle are together equal to two right angles. 4. If a straight line be divided into any two parts, the square of the whole line is equal to the squares...
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Outlines of moral philosophy, with a mem., a suppl., and questions by J. M'Cosh

Dugald Stewart - 1864 - 206 pages
...constitution as the equality of the three angles of a triangle to two right angles" (§.200.). That the three angles of a triangle are together equal to two right angles is a truth to all intelligences, is a truth to God. That love is good, that cruelty is bad, is in like...
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The Intuitions of the Mind Inductively Investigated

James McCosh - 1865 - 522 pages
...inhabited, even this is not a primary conviction ; we believe it because of secondary testimony. Nay, that the three angles of a triangle are together equal to two right angles, is not a primitive judgment, for it needs other truths coming between to carry our conviction. But...
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A Dictionary of Science, Literature, & Art: Comprising the ..., Volume 1

William Thomas Brande, George William Cox - 1865 - 978 pages
...considered generally, and without restriction to any individual magnitude. Thus, the proposition that the three angles of a triangle are together equal to two right angles, is an abstract truth, applying equally to all triangles whatsoever. Abstract Mathematics is opposed...
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The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1867 - 424 pages
...equilateral ; therefore the three angles EGD, GDE, DEG are equal to one another. [I. 5. Corollary. But the three angles of a triangle are together equal to two right angles ; [I. 32. therefore the angle EGD is the third part of two right angles. In the same manner it may...
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