Answer :
Given,
AD perpendicular to BC
∠A = 100o
In ,
∠ADB + ∠B + ∠DAC = 180o
90o + ∠B + ∠A = 180o
∠B + * 100o = 180o – 90o
∠B + 50o = 90o
∠B = 40o
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