Book, Paragraph

 1   V, 14 |  quality because it is without angles,-which shows that the essential
 2   V, 30 |     its essence, as having its angles equal to two right angles
 3   V, 30 |      angles equal to two right angles attaches to the triangle.
 4  VI, 2  | different from "triangle whose angles are equal to two right angles".-
 5  VI, 2  |  angles are equal to two right angles".-And this happens naturally
 6  IX, 9  |       potentially. Why are the angles of the triangle equal to
 7  IX, 9  |    triangle equal to two right angles? Because the angles about
 8  IX, 9  |      right angles? Because the angles about one point are equal
 9  IX, 9  |   point are equal to two right angles. If, then, the line parallel
10  IX, 10 |   suppose that at one time its angles are equal to two right angles
11  IX, 10 |  angles are equal to two right angles while at another time they
12  XI, 4  |        detached, e.g. lines or angles or numbers or some other
13 XIII, 8 |    angle is divided into acute angles. As matter, then, the acute
14 XIII, 9 |       a plane; again, how will angles and figures and such things
15 XIII, 10|     that this triangle has its angles equal to two right angles,
16 XIII, 10|      angles equal to two right angles, unless every triangle has
17 XIII, 10|  unless every triangle has its angles equal to two right angles,
18 XIII, 10|      angles equal to two right angles, nor that this man is an