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

## A Practical and Philological Text-book on the Analysis of Sentences, Parsing ...

John I. Jones - 1884 - 254 pages
...head. (6) Thou cam'st not to thy place by accident ; it is the very place God meant for fclicc. (7) The three angles of a triangle are together equal to two right angles ; hence a triangle can have but one right angle. (8) The safe weighs 15 cwt., so one man could not...

## Annual Report of the Commissioners ..., Volume 50

1884 - 648 pages
...feet and 45 feet ; find the area of the space included between the circles. 5 marks. 9. Prove that the three angles of a triangle are together equal to two right angles. 5 marks. 10. The diameter of a circular field is 5 chains 45 links ; calculate the rent of the field...

## The Eclectic School Geometry: A Revision of Evan's School Geometry

Evan Wilhelm Evans - 1884 - 170 pages
...produced. It is the supplement of the adjacent interior angle (Theo. 1). THEOREM X. The three interior angles of a triangle are together equal to two right angles. The construction line BE is drawn parallel to AC. EBD = CAB (Theo. III.) CBA = CBA EBD + CBE + CBA = CAB...

## The Common Sense of the Exact Sciences

William Kingdon Clifford - 1885 - 310 pages
...our second assumption about space leads Tery easily to a theorem of especial importance, viz. that the three angles of a triangle are together equal to two right angles. If we draw through A, a corner of the triangle ABC (fig. 20), a line DAE, making with the side AO FIG....

## Thoughts on Science, Theology, and Ethics

John Wilson (M.A., Trinity coll. Dublin.) - 1885 - 212 pages
...apparentâ€”and so, in this sense, to discover it, in regard to particular cases. The general proposition that "the three angles of a triangle are together equal to two right angles," states nothing more than was already stated by implication in the axioms and definitions. What the...

## Religion: A Revelation and a Rule of Life

William Kirkus - 1886 - 400 pages
...us. In the sense that nobody can prevent us, we are free to deny the multiplication table, or that the three angles of a triangle are together equal to two right angles ; but he who should so use his liberty would be regarded not as a splendid and daring genius, but as...

## The Baptist Quarterly Review, Volume 8

1886 - 672 pages
...whatever. The most superlative scoundrel that ever lived believed, and could not but believe, that the three angles of a triangle are together equal to two right angles, supposing that he has followed the steps of the demonstration. But there is no moral principle involved...

## A Text-book of Deductive Logic: For the Use of Students

P. K. Ray, Prasanna K. Ray - 1886 - 426 pages
...<fec. Examples. 1. "No man is perfect": categorical, negative, assertory, universal, and real. 2. " The three angles of a triangle are together equal to two right angles " : categorical, affirmative, assertory in form, but really necessary, universal, and real. 3. " Some...