Which of the following statements is not valid?
O When two triangles are congruent by HL, the triangles are right triangles.
O When two triangles are congruent by AAS, pairs of corresponding angles are congruent.
O When two triangles are congruent by SSS, no pairs of corresponding angles are congruent.
O If two right triangles are congruent by SAS, their corresponding pairs of acute angles are complementary.
