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The centres of circles whose radii are 7...

The centres of circles whose radii are 7 cm & 9 cm are O and `O_(1)` respectively. The distance between O & `O_(1)` is 20cm. If PQ is transversal common which intersect `OO_(1)` at R. then find the length of OR.

A

10 cm

B

12 cm

C

`(35)/(4)`cm

D

`(45)/(4)`cm

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