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If Figure-1, from an external point P, t...

If Figure-1, from an external point P, two tangents PQ and PR are drawn to a circle of radius 4 cm with centre O. if `angleQPR=90^(@)`, then length of PQ is

A

`3` cm

B

`4` cm

C

`2` cm

D

`2sqrt(2)` cm

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