ABCD রম্বসের ∠A = 60° হলে ∠D = কত?

A ৬০°

B ৮০°

C ১০০°

D ১২০°

Solution

Correct Answer: Option D


∠ A ও  ∠D দুটি সন্নিহিত কোণ ।
 ∠A+∠D = 180°
 ∴∠D = 180° - A
        = 180° - 60°
        = 120°

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