Part, Question

 1   1, 12  | scientific ~demonstration that a triangle has three angles equal to
 2   1, 81  |        for the three angles of a triangle to be ~equal to two right
 3   1, 84  |        of a ~circle applied to a triangle; or when a definition is
 4   2, 33  |      that the three angles of a ~triangle are together equal to two
 5   2, 52  |         figures of quantity, ~as triangle and tetragon.~Aquin.: SMT
 6   2, 52  |        are given the nature of a triangle ~or a circle, are accordingly
 7   2, 72  |      numbers and figures: for a ~triangle is distinguished from a
 8   2, 94  |       that the three angles of a triangle ~are together equal to two
 9 Suppl, 80|      that the ~three angles of a triangle should not be equal to two
10 Appen1, 2|       but thinks perhaps about a triangle having its ~three angles