Quantitative Aptitude Geometry Triangles, Congruence and Similarity

 ΔABC ରେ, O ହେଉଛି ଦିଆଯାଇଥିବା ତ୍ରିଭୁଜ ପାଇଁ ଲମ୍ବକେନ୍ଦ୍ର ଏବଂ I ହେଉଛି ଅନ୍ତଃକେନ୍ଦ୍ର, ଯଦି ∠BIC - ∠BOC = 90∘, ତେବେ ∠A ମାପ ନିରୂପଣ କର ।  

1
120∘
2
140∘
3
90∘
4
180∘

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