Respuesta :

Nope. They are not similar. 

Only UT and XW are proportional, while the others are not. You know this by 12 times 2 = 24, which is XW to UT.
ΔSTU ~ ΔVWX
      ⁶/₁₂ = ¹²/₂₄
       ¹/₂ = ¹/₂

These triangles are similar.