In the figure below, WU ≅ VT. Square W V U T has point Y in the middle. Lines are drawn from each point of the square to the opposite point to form 4 triangles. Angle W T U and T U V are right angles. The congruency theorem can be used to prove that △WUT ≅ △VTU.

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?