Respuesta :

Answer:

∠A = 72°

∠B = 18°

Step-by-step explanation:

∠A + ∠B = 90°

∠A = 4∠B

4∠B + ∠B = 90°

5∠B = 90°

∠B = 90° : 5

∠B = 18°

∠A = 4×18°

∠A = 72°

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