Book, Paragraph

 1      I, 24|       the base of an isosceles triangle are equal. Suppose the lines
 2      I, 35|        two right angles, B for triangle, C for isosceles triangle.
 3      I, 35|      triangle, C for isosceles triangle. A then belongs to C because
 4      I, 35|       of another term: for the triangle in virtue of its own nature
 5     II, 17|       on the assumption that a triangle contains more than two right
 6     II, 21|        two right angles, B for triangle, C for a particular diagram
 7     II, 21|        particular diagram of a triangle. A man might think that
 8     II, 21|      though he knew that every triangle contains two right angles;
 9     II, 21| expression "to know that every triangle has its angles equal to
10     II, 21|      know that the figure is a triangle. Similarly in all other