Respuesta :

<B i.e. <1 = 115

<B = <ADC or angle 4 = 115 [Opposite angles of rhombus are equal]

angle 4 = angle 5 = 115[Being vertically opposite angles]

angle 6+ angle 5 = angle 8[Exterior angle of a triangle is equal to sum of two interior opposite angles]

or, 40+115 = angle 8

or, angle 8 = 155

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