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

In the given figure, PQRS is a rectangle and a semicircle with SR as diameter is drawn. A circle is drawn as shown in the figure. If `QR = 7 cm`, then what is the radius (in cm.) of the small circle?

A

`21+14 sqrt2`

B

`21-14 sqrt2`

C

Both `21+14 sqrt2` and `21-14 sqrt2`

D

None of these

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