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

दी गई आकृति में, ∠ABC = 81° और ∠ACB = 9° है। ∠BDC का मान कितना है?

1
80° 
2
90° 
3
70° 
4
60° 
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