Search Images Maps Play YouTube News Gmail Drive More »
 Books Books
... 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

## Logic: Or, The Art of Reasoning Simplified. With Exercises on a Variety of ...

S. E. Parker - 1837 - 344 pages
...the same thing, at the same time, to be, and not to be. A killed B, according to the testimony of C. The three angles of a -triangle are together equal to two right angles. Nothing, or that which is not a thing, cannot produce anything. A being powerless cannot operate. What...

## The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - 1837 - 410 pages
...the angles at its base BD double of the third angle A : which was to be done. Cor. Since i; I. 32.) the three angles of a triangle are together equal to two right angles, it is plain, that the angle A is one-fifth, and each of the* angles at the base BD, two-fifths of two...

## Logic, or the Art of Reasoning simplified, etc

S. E. PARKER - 1838 - 340 pages
...— " a whole is greater than each of its parts," is different from that, which informs me, that " the three angles of a triangle are together equal to two right angles ;" and that again is likewise different from the evidence implied in the proposition, " A killed B,...

## Distinguished men of modern times [selected from The gallery of portraits ...

Arthur Thomas Malkin - 1838 - 544 pages
...advanced as far as the thirty-second proposition of the first book of Euclid. He had perceived that the three angles of a triangle are together equal to two right ones, and was searching for a satisfactory proof, when his father surprised him in his forbidden speculations....

## The Eclectic Magazine of Foreign Literature, Science, and Art, Volume 18

1849 - 600 pages
...they confined themselves to the teaching of such simple truths as that two and two make four, and that the three angles of a triangle are together equal to two right angles ? And what holds good of a branch of secular education holds good of it in its entirety. If mathematics...

## The First Six, and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - 1845 - 382 pages
...of the angles at its base BD double of the third angle A : which was to be done. Cor. Since (I. 32) the three angles of a triangle are together equal to two right angles, it is plain, that the angle A is one fifth, and each of the angles at the base BD, two fifths of two...

## The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846 - 292 pages
...equal to DE, and the triangle EGD is equilateral, and therefore also equiangular (1. 5. Cm.) : But the three angles of a triangle are together equal to two right angles; therefore the angle EGD is the third part of two right angles : And, in like manner, it may be shewn...

## Outlines of the History and Formation of the Understanding

William Ellis - 1847 - 152 pages
...lamb was devoured by the wolf," —"the air is elastic,"—" I love you,"—"you don't love me,"—" the three angles of a triangle are together equal to two right angles," —" brutes cannot articulate,"—" electricity is the most efficient known agent for rapidity of communication,"—"...