In the process of proving that opposite sides of a parallelogram are congruent, Ross drew a diagonal of the parallelogram and de
termined that the two triangles formed are congruent. He then concluded that opposite sides must be congruent, because corresponding parts of congruent triangles are congruent. Using his markings in the diagram, which postulate allowed him to determine that the two triangles formed are congruent?
So 6 times 6 is 36 so 36 possibilities and the number that add up to 3 or nine are (2,1; 3,6; 4,5;) so 3 out of 36 or 1 out of 12, the answer is not there