Respuesta :

Answer:

x = 20

Step-by-step explanation:

Total degrees of a triangle = 180 degrees.

The three angles are x, 4x & 4x

x + 4x + 4x = 180 degrees

x + 8x = 180 degrees

9x = 180 degrees

(9x)/9 = 180/9

x = 180/9

x = 20

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