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Two circles with centres P and Q of radi...

Two circles with centres P and Q of radii 7 cm and 3cm, respectively, touch each other externally at a point A. BC is a direct common tangent to these two circles where B and C are the point on the circles respectively. The length of BC is:

A

`sqrt(21)` cm

B

`3 sqrt(21)` cm

C

`2 sqrt(21)` cm

D

`4 sqrt(21)` cm

Text Solution

Verified by Experts

The correct Answer is:
C
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