ABCD রম্বসের ∠B = 80° হলে, ∠C = কত?

A 120°

B 70°

C 80°

D 100°

Solution

Correct Answer: Option D

ABCD রম্বসের  ∠B=80°
 অতএব ∠D=80°
 অতএব ∠C=∠A= (360-160)/2=200/2=100°

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