A 90˚
B 85˚
C 75˚
D 65˚
Correct Answer: Option D
∠A + ∠B = 180o [ ∠A ও ∠B সম্পূরক কোণ ]
বা, 115o +∠B = 180o ∠B = 180o - 115o = 65o
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