Respuesta :

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Answer:

if 9x = 180 degree

Step-by-step explanation:

one x equal to 20 degree

and if 3x= 60 degree the ? = 120 degree

Answer:

∠ ABF = 120°

Step-by-step explanation:

HCI is a straight line , so

3x + 2x + 4x = 180 , that is

9x = 180 ( divide both sides by 9 )

x = 20

∠ ABF and ∠ BCI are corresponding angles and are congruent , so

∠ ABF = 2x + 4x = 6x = 6(20) = 120°

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