A 180°
B 240°
C 270°
D 360°
Correct Answer: Option D
বহিঃস্থ কোণ তিনটির সমষ্টি,= ∠ACD + ∠BAE + ∠CBF= 180° - γ + 180° - α + 180° - β= 540° - (α + β + γ)= 540° - 180°= 360°
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