The outer angle of the triangle ABC at the vertex A is 114°12'. The outer angle at the vertex B is 139°18'. What size is the internal angle at the vertex C?

Correct answer:

γ =  73.5 °

Step-by-step explanation:

 α=11412=114.2 β=13918=139.3 γ=114.2+139.3180=7330=73.5

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