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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

`6 sqrt(10)`

D

`3 sqrt(5)`

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The correct Answer is:
A
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