What is the similarity ratio of QRST to YVWX?

Answer:
2
Step-by-step explanation:
Since the figures are similar then the ratios of corresponding sides are equal.
QRST → YVWX ← shows the corresponding sides , then
similarity ratio = [tex]\frac{WX}{ST}[/tex] = [tex]\frac{4}{2}[/tex] = 2