No.
They're sides may not be congruent.
No
That their sides are congruent.
No
No.
They're sides may not be congruent.
No
Yes.
if the sides of two rectangles are equal then they r congrunt
Rectangular prism
That their sides are congruent.
No
They make two congruent rectangles, not to rectangles! This is because the line joining the midpoints of opposite sides are lines of [reflective] symmetry.
It is always true because two congruent angles that are complementary both measure 45 degrees.
Yes.
Yes.