very simple question

Answer:
m∠B = m∠Y
Explanation:
Since the two triangles are similar, just align them together and see which one is the same in order.
Δ A B C
Δ X Y Z
m∠A = m∠X
m∠B = m∠Y
m∠C = m∠Z
Good morning
Answer:
m∠B
Step-by-step explanation:
NOTE: If two triangles are similar the their corresponding angles are equal in measures
since ∠Y correspond to the ∠B then m∠B = m∠Y.
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:)