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In the given figure PQ and PR are tangen...

In the given figure PQ and PR are tangents of a semicircle. Center O of this semicircle lies on QR. If QO = 2 cm and OR = 4 cm. If `angleP=90^(@)` the radius of the semicircle is?

A

a)`(4)/(sqrt(5))`

B

b)`(3)/(sqrt(5))`

C

c)4

D

d)3

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