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" When you have proved that the three angles of every triangle are equal to two right angles... "
Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books - Σελίδα 130
των Euclid - 1765 - 464 σελίδες
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The Freethinking Christians' Magazine: Intended for the Promotion ..., Τόμος 3

1813 - 596 σελίδες
...they concurred in the plain and pre-established propositions that " two and two are four, and that the three angles of every triangle are equal to two right angles," were perfectly correct, and found every thing as it should be; " but, when each left this guide, and...

Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1819 - 350 σελίδες
...triangles, the four oblique angles of whJrh are equal to the three angles of the triangle, therefore the three angles of every triangle are equal to two right angles. Q, ED Though this method of treating the subject is strictly demonstrative, ;yet, as the reasoning...

A Treatise on the Elements of Algebra

Bewick Bridge - 1821 - 648 σελίδες
...180°. Thus, if the angle ACF is 40° 25' 35", its supplement FCB will be 139° 34' 25".* 6. The * Since the three angles of every triangle are equal to two right angles, or to 180°, it is evident that in a right-angled triangle the two acute angles must be together equal...

A Search of Truth in the Science of the Human Mind, Part First, Τόμος 1

Frederick Beasley - 1822 - 584 σελίδες
...space included between three straight lines that cut each, ever lead us on to the conclusion, that the three angles of every triangle, are equal to two right angles? Does it at all enter into the inquiry? Does it form any part of the argument? A man might long enough...

An Outline of the History of the Church in the State of Kentucky, During a ...

Robert Hamilton Bishop - 1824 - 464 σελίδες
...present comprehension, and its being contrary to the first principles of reason. The proposition that the three angles of every triangle are equal to two right angles, is one absolutely beyond the comprehension of the illiterate hushnndman; is it therefore not true!...

An Inquiry Into the Principles of the Distribution of Wealth Most Conducive ...

William Thompson - 1824 - 634 σελίδες
...applied to one out of a class or of a thousand, not able to understand, when properly explained, that " the three angles. of every triangle are equal to two right angles." Till this fundamental error and vice in education, the presuming to teach opinions instead of truth,...

Euclid's Elements of geometry, transl. To which are added, algebraic ...

Euclides - 1826 - 226 σελίδες
...equal to two right angles. " 32.i. it are equal* to two right angles ; join AD, вс. Therefore because the three angles of every triangle are equal to two right angles, the angles CAB, ABC, CBA, are equal to two right angles. But the Let ABDC be a circle, and ABDC a quadrilateral...

Elements of Geometry, Containing the First Six Books of Euclid

Euclid - 1826 - 234 σελίδες
...opposite angles of • 52. i. it are equal" to two right angles ; join AD, вс. Therefore because the three angles of every triangle are equal to two right angles, the angles CAB, ABC, CBA, are equal to two right angles. But the '• Zi.3. angle ABC is equal b to the...

History of the Transmission of Ancient Books to Modern Times: Or, A Concise ...

Isaac Taylor - 1827 - 298 σελίδες
...more readily and by a simpler and more compact process than that of the other. If it were denied that the three angles of every triangle are equal to two right angles, an actual measurement of lines, or the placing of two pieces of card one over the other, would end...

History of the Transmission of Ancient Books to Modern Times: Or, A Concise ...

Isaac Taylor - 1827 - 290 σελίδες
...more readily and by a simpler and more compact process than that of the other. If it were denied that the three angles of every triangle are equal to two right angles, an actual measurement of lines, or the placing of two pieces of card one over the other, would end...




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