Book, Paragraph

 1  II, 9 | necessary that the angles of a triangle should equal two right angles.
 2  II, 9 |     true, if the angles of the triangle are not equal to two right
 3  IV, 14|       scalene are not the same triangle, yet they are the same figure,
 4  IV, 14|       but not if they do; e.g. triangle differs from triangle by
 5  IV, 14|     e.g. triangle differs from triangle by a differentia of triangle,
 6  IV, 14|   triangle by a differentia of triangle, therefore they are different
 7  IV, 14|      figure of another kind of triangle, and a triangle of one kind
 8  IV, 14|        kind of triangle, and a triangle of one kind is equilateral
 9  IV, 14|      kind is equilateral and a triangle of another kind scalene.
10  IV, 14|       same figure, then, that, triangle, but not the same triangle.
11  IV, 14|     triangle, but not the same triangle. Therefore the number of
12 VIII, 1| universal application. Thus, a triangle always has its angles equal