Answer :

Given: AOB = 130°


Here,


(Exterior AOB) = 360° – (interior AOB)


(Exterior AOB) = 360° – 130°


(Exterior AOB) = 230°


We know that,


(Exterior AOB) = 2 × ACB


230° = 2 × ACB


ACB = = 115°


ACB = 115°

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