Answer :

Given, TOF,TIS and TIF

In ∆TOF,


T + O + F = 180


25 + 110 + SFT = 180


SFT = 180-135


SFT = 45


In ∆TOS,


T + O + S = 180


35 + (180-110) + OST = 180


35 + 70 + OST = 180


OST = 180-105


OST = 75


STO = T(in triangle SOT) = 35


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