14. Prove that if AABC and ADEF are triangles with equal defects and a pair of congruent sides their associated Saccheri quadrilaterals are congruent. (Hint: Recall that the angle sum for a triangle is equal to the sum of the measures of the summit angles of its associated Saccheri quadrilateral and that the two summit angles of a Saccheri quadrilateral are congruent.) 17 how do we know that S and B are on opposite sides of Po