Respuesta :

choixongdong
∠A and ∠B are vertical angles
so
∠A =∠B 
   x = 4x - 30
4x - x = 30
3x = 30
  x = 10

m<A= x = 10

answer
m<A = 10

Answer:

m<A = 10

Step-by-step explanation:

Ver imagen amp0476

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