The outer angle of the triangle ABC at vertex A is 113°36'. The outer angle at vertex B is 119°54'. What size is the internal angle at vertex C?

Correct answer:

γ =  53.5 °

Step-by-step explanation:

 α=113°36=113.6 β=119°54=119.9 γ=113.6+119.9180=53°30=53.5

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