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i) Angle OAB + Angle AOB +Angle ABO = 180 °(Angle sum property of triangle)
(Angle AOB is vertically opposite to DOC so it is 65°)
35°+65°+Angle ABO =180°
100°+Angle ABO = 180
Angle ABO = 180-100=80
So Angle ABO = 80°
ii) Angle BCD = Angle DAB
Angle DAB= 40 + 35 = 75°
So Angle BCD = 75°
iii) Angle ADC + Angle BCD = 180° because adjacent angles are supplementary in parallelogram
Angle ADC =180-75=105°
So Angle ADC = 105°
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