∠A ও ∠B পরস্পর সম্পূরক কোণ। ∠A = 115° হলে ∠B = কত?

A 65°

B 75°

C 85°

D 90°

Solution

Correct Answer: Option A

    ∠A + ∠B = 180     [ ∠A ও ∠B সম্পূরক কোণ ] 

 বা, 115o +∠B = 180o        ∠B = 180o  - 115o  = 65o   

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