Respuesta :

Assuming line EC is straight, angle EBF = 90-angle CBD

(3x-6)=90-(45-x)
3x-6=45+x
2x-6=45
2x=51
x=25.5

Now just replace X with 25.5 in both of the angles

45-25.5=19.5 angle CBD
90-19.5=70.5 angle EBF

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