What is m∠C? Enter your answer in the box. ° A triangle labeled A B C. Side B C is the base, side A B is perpendicular, and side A C is the hypotenuse. Angle A is labeled x degrees, angle B is labeled 3 x degrees, and angle C is labeled 2 x degrees.

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?