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The opposite angles of any quadrilateral figure described in a circle, are toe/ether equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD : any two of its opposite angles are together equal to two right angles.
Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ... - Page 71
by Euclid - 1845 - 199 pages

## Plane and Solid Geometry

James Howard Gore - Geometry - 1899 - 266 pages
...a quadrilateral have two of its opposite sides parallel, and the other two equal but not parallel, any two of its opposite angles are together equal to two right angles. 40. The sum of the perpendiculars from any point in the interior of an equilateral triangle is equal...

## Life and Remains of the Rev. R. H. Quick

Robert Hebert Quick - Teachers - 1899 - 564 pages
...We wish to recall that proposition. Arbitrary association of ideas immediately suggests the words, 'The three angles of every triangle are equal to two right angles.' But at first these are words only : our mind runs along an established train of sounds. By well-formed,...

## Spinoza; a Handbook to the Ethics

James Allanson Picton - Ethics - 1907 - 282 pages
...from are always verifiable. The skilled surveyor's measurements by triangulation assume always that the three angles of every triangle are equal to two right angles. And any one who wantsvefification can have it, either roughly and imperfectly by the use of instruments...

## An Outline of Logic

Boyd Henry Bode - Logic - 1910 - 348 pages
...predicate. ' William Pitt was a great statesman ' = ' There was a great1 statesman named William Pitt '; ' The three angles of every triangle are equal to two right angles ' = ' There are figures known as triangles with their three angles equal to two right angles '; ' All...

## Mind, Volume 23

Electronic journals - 1914 - 662 pages
...for such a proposition as " My first penitent was a murderer " seems to be offered as adequate for " The three angles of every triangle are equal to two right angles ". Granting for the sake of argument that the first proposition really means that the same individual...

## The Elements of Non-Euclidean Plane Geometry and Trigonometry

Horatio Scott Carslaw - Geometry - 1916 - 193 pages
...geometry holds only on the assumption that the Constant is infinite. Only in this case is it true that the three angles of every triangle are equal to two right angles ; and this can easily be proved, as soon as we admit that the Constant is infinite." This document...

## How We Learn: A Short Primer of Scientific Method for Boys

William Henry Samuel Jones - Reasoning - 1916 - 82 pages
...up. Nothing is taken on trust ; every step is understood and commands our intellectual assent. That the three angles of every triangle are equal to two right angles is a proposition which cannot be denied by anyone who has assented to the definitions and axioms which...

## The New Tinsmith's Helper and Pattern Book: A Textbook and Working Guide for ...

Hall V. Williams - Tinsmithing - 1917 - 382 pages
...its defect from a right angle. 2. The supplement of an angle is its defect from two right angles. 3. The three angles of every triangle are equal to two right angles : hence the oblique angles of a right angled triangle are each other's complements. 4. The sum of the...

## The New Tinsmith's Helper and Pattern Book: A Textbook and Working Guide for ...

Hall V. Williams - Tinsmithing - 1920 - 378 pages
...its defect from a right angle. 2. The supplement of an angle is its defect from two right angles. 3. The three angles of every triangle are equal to two right angles : hence the oblique angles of a right angled triangle are each other's complements. 4. The sum of the...

## The Philosophical Writings of Descartes: Volume 2

René Descartes - Philosophy - 1984 - 444 pages
...cannot divide it, at least in our thought). And because of these facts it can be truly asserted that the three angles of every triangle are equal to two right angles and that every body is divisible. Fifthly, \ ask my readers to spend a great deal of time and effort...