Respuesta :

Answer:

60

Step-by-step explanation:

⇒∠1+∠2=180      (1)

and

⇒∠2=60+∠1

so the upper eq (1) becomes

⇒∠1+60+∠1=180

⇒2∠1+60=180

⇒2∠1=180-60

⇒2∠1=120

dividing both side by 2

⇒∠1=60

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