That the parallel sides of the rectangle aren't congruent, maybe.
<span>The answer is AAS. </span><span>Angle Angle Side </span>postulate<span> </span><span>states that if two angles and the non-included side one triangle are congruent to two angles and the non-included side of another triangle, then these two triangles are congruent.</span>
The answer & explanation for this question is given in the attachment below.