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Length of common chord of the circles: (...

Length of common chord of the circles: `(x-1)^2 +(y+1)^2 =r^2` and `(x+1)^2 + (y-1)^2 =r^2` is :

A

`sqrt(r^2-2)`

B

`r+2`

C

`1/2sqrt(r^2-2)`

D

`2sqrt(r^2-2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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