In the figure given figure, PQRS is a sq...

In the figure given figure, PQRS is a square inscribed in a circle of radius 4 cm. PQ is produced till point Y. From Y a tangent in drawn to the circle at point R (QR=QY). What is the length (in cm) of SY?

a)`4sqrt(10)`

b)`2sqrt(10)`

c)`6sqrt(10)`

d)`3sqrt(5)`

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