Respuesta :

bayimarti307

Step-by-step explanation:

angles in a triangle add up to 180degree

  1. 3x + 36 + 90 = 180
  2. 3x =180 - 30 - 90
  3. 3x = 60
  4. divide through by 3 gives
  5. x = 20degree
  6. Therefore x =20°

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