Respuesta :

devishri1977

Answer:

x = 4.5

Step-by-step explanation:

8x + 12x + 90 = 180   {Sum of all angles of a triangle is 180}

20x + 90= 180

20x        = 180 - 90

       20x = 90

             x = 90/20

             x = 4.5

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