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Answer:
since OS,OP,OQ are radius
OS=OP=OQ
now , In ΔROQ
OQ=QR
∠ORQ=∠ROQ
∠ROQ=20°
∴∠ROQ=140°
∠POQ=40°
In ΔPOQ
OP=OQ
∠POQ=∠QOP=40°
∴∠POQ=100°
Now, ∠POS + ∠POQ + ∠QOR = 180°
∠POS + 100 + 20 = 180°
∴∠POS = 60°
Answer:
What there is no Repaying in Friendship !