6. opposite sides of a parallelogram are congruent
Don't we already know the opposite sides of a rectangle are congruent without six steps?
8. SAS Side Angle Side Theorem
They picked the wrong triangles, they should show
BAD is congruent to ABC
9. They're probably looking for CPCTC, corresponding parts of congruent triangles are congruent. But AC isn't in either of the triangles they showed congruent.
My professional opinion is this question sucks.
