ABCD রম্বসের ∠A=60° হলে ∠D = কত?
Solution
Correct Answer: Option D
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∠ A ও ∠D দুটি সন্নিহিত কোণ ।
∠A+∠D=180°
∴∠D=180°-A
=180°-60°=120°
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