Q. 149
In parallelogram FIST. Find 
SFT, 
OST and 
STO.
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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