Correct Answer: Option C

Explanation

∠BFC = 180° - a° (adjacent angles on a straight line)

∴ a° + b° + c° + ∠BFC = 360° (quadrilateral) a° + b° + c° + (180° - a°) = 360°

b° + c° = 360° - (180° - a°) - a°

b° + c° = 360° - 180° + a° - a°

b° + c° = 180°

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