ABC ত্রিভুজের AB = AC এবং ∠A = 60° হলে ∠B = কত?
Solution
Correct Answer: Option D
ΔABC এর AB = AC
∴ ∠C = ∠B
এখন, ∠C + ∠B + ∠A = 180°
বা, 2∠B = 180° - 60°
বা,∠B = 60°
∴ ∠C = ∠B
এখন, ∠C + ∠B + ∠A = 180°
বা, 2∠B = 180° - 60°
বা,∠B = 60°
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