O ହେଉଛି ΔPQR ର ଅନ୍ତଃକେନ୍ଦ୍ର, ∠PQR = 60° ଏବଂ ∠PRQ = 50°. ତେବେ ∠QOR ହେବ : 

1
55° 
2
130° 
3
125° 
4
120° 

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