Which student is wrong and why?

Just tell me how to set up the equation.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Which must be true in order for the relationship △zyv ~ △xwv to be correct? zy ∥ wx ∠z ≅ ∠y and ∠w ≅ ∠x zv ≅ vy and wv ≅ vx ∠z ≅ ∠x and ∠w ≅ ∠y