railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Geometry Circle

প্রদত্ত চিত্রে, ∠ABC = 81° এবং ∠ACB = 9°। ∠BDC এর মান কত?

1
80°
2
90°
3
70°
4
60°
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